{"id":15792,"date":"2026-08-17T09:00:00","date_gmt":"2026-08-17T07:00:00","guid":{"rendered":"https:\/\/tps-elektronik.com\/?p=15792"},"modified":"2026-07-23T03:56:39","modified_gmt":"2026-07-23T01:56:39","slug":"what-is-tps-custom-power-supply-solution-for-high-speed-rail-trackside-signaling-and-interlocking-and-why-it-is-indispensable-for-en-50125-wide-voltage-range-and-surge-immunity","status":"publish","type":"post","link":"https:\/\/tps-elektronik.com\/en\/what-is-tps-custom-power-supply-solution-for-high-speed-rail-trackside-signaling-and-interlocking-and-why-it-is-indispensable-for-en-50125-wide-voltage-range-and-surge-immunity\/","title":{"rendered":"What Is TPS Custom Power Supply Solution for High-Speed Rail Trackside Signaling and Interlocking and Why It Is Indispensable for EN 50125 Wide Voltage Range and Surge Immunity?"},"content":{"rendered":"<article class=\"blog-post\" lang=\"en\"><header>\n<p>System integrators, panel builders, and procurement teams working on high-speed rail infrastructure face a persistent challenge: trackside signaling and interlocking equipment must operate reliably across a wide voltage range while withstanding surges that would destroy standard industrial power supplies. The railway environment is uniquely demanding. Extreme temperature variations from -40\u00b0C to +85\u00b0C, long-term shock and vibration, and exposure to uncontrolled electromagnetic interference. Off-the-shelf power supplies rarely survive these conditions.<\/p>\n<p>TPS Elektronik&#8217;s custom power supply solutions for railway trackside signaling and interlocking engineered to meet the rigorous demands of EN 50125. The European standard that defines environmental conditions for railway equipment. From wide voltage range input stages to surge immune output protection, our mechatronic power modules deliver the reliability that high-speed rail signaling demands.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/ems\/mechatronics\/\">Request a custom railway power supply consultation \u2192<\/a><\/p>\n<\/header><nav class=\"toc\" aria-label=\"Table of contents\">\n<h2 id=\"toc\">Table of Contents<\/h2>\n<ol>\n<li><a href=\"#why-en-50125-matters\">Why EN 50125 Compliance Matters for Trackside Signaling Power Supplies<\/a><\/li>\n<li><a href=\"#wide-voltage-range\">Wide Voltage Range Design: The Foundation of Railway Power Supply Reliability<\/a><\/li>\n<li><a href=\"#surge-immunity\">Surge Immunity: Protecting Signaling and Interlocking from Railway Transients<\/a>\n<ol>\n<li><a href=\"#surge-sources\">Sources of Surges in Railway Environments<\/a><\/li>\n<li><a href=\"#surge-protection\">Surge Protection Strategies for Trackside PSUs<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"#tps-approach\">The TPS Approach: Custom Power Supply Solutions for Railway Infrastructure<\/a><\/li>\n<li><a href=\"#applications\">Applications: From Point Machines to ETCS Lineside Electronic Units<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"why-en-50125-matters\">\n<h2>1. Why EN 50125 Compliance Matters for Trackside Signaling Power Supplies<\/h2>\n<p>EN 50125 is the European standard that defines environmental conditions for railway equipment. It covers a comprehensive range of parameters that directly impact power supply design: altitude, temperature, humidity, air movement, rain, snow, hail, ice, lightning. Electromagnetic compatibility, solar radiation, pollution, vibrations, shocks, and environmental conditions in tunnels. The standard applies to fixed electrical installations for traction power supply, signaling and telecommunications systems. And equipment essential to operate a railway.<\/p>\n<p>For power supply designers, EN 50125 is not optional. It is the baseline for any product destined for European railway infrastructure. The standard defines the environmental design envelopes that inform component selection, thermal management, corrosion protection, EMC mitigation, and mechanical design. A power supply that fails to meet these requirements will not survive the railway environment. And the consequences of failure\u2014signal loss, interlocking faults. Or point machine malfunction\u2014are unacceptable in safety-critical systems.<\/p>\n<p>EN 50125-2 specifically addresses fixed electrical installations used in railway applications. Its purpose is to provide a unified framework for manufacturers, system integrators, and railway operators to ensure that critical stationary equipment operates with high reliability, safety, and a long service life. Adherence to EN 50125-2 is essential for guaranteeing the integrity of systems vital to train operations. Such as signaling, power supply, and telecommunications. The standard dictates minimum requirements for equipment to withstand the often harsh and demanding environments found alongside railway lines, in substations, and within control centers.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-15038\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/0724-2-programmable-power-supply-dc-EA-PU-10360-480-6U-60000W.jpg\" alt=\"programmable power supply dc\" width=\"800\" height=\"600\" \/><\/p>\n<p><em>Image Generation Prompt: \u201cRailway trackside signaling equipment cabinet with custom power supply modules mounted on DIN rail, ruggedized enclosure with surge protection devices, professional railway infrastructure environment, photorealistic, wide shot, industrial setting\u201d \u2014 Alt: Railway trackside signaling cabinet with custom power supply modules<\/em><\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/ems\/mechatronics\/\">Explore TPS railway power supply solutions \u2192<\/a><\/p>\n<\/section>\n<section id=\"wide-voltage-range\">\n<h2>2. Wide Voltage Range Design: The Foundation of Railway Power Supply Reliability<\/h2>\n<p>One of the most critical requirements for trackside signaling power supplies is the ability to operate across a wide input voltage range. Railway power sources are notoriously unstable. Nominal voltages of 24V, 36V, 48V, 72V, and 110V DC are common, but actual input voltages can fluctuate dramatically due to traction system demands, distance from substations, and network conditions. A power supply designed for a narrow input range will fail when the voltage dips or spikes. And in trackside signaling, failure is not an option.<\/p>\n<p>TPS Elektronik addresses this challenge through custom power supply designs that incorporate wide-voltage-range input stages. Our engineering team leverages pre-engineered, pre-tested topologies to deliver customizable power supply solutions that match exact specifications while drastically reducing development time and certification risks. By utilizing a library of proven power platforms, we can create a modified standard power supply that behaves exactly like a custom unit but is delivered in a fraction of the time.<\/p>\n<p>The wide voltage range capability is particularly important for interlocking systems. Which control point machines, signals, and level crossing barriers. These systems require stable power regardless of input fluctuations. A custom power supply with a wide input range ensures that the interlocking logic remains powered and functional even when the trackside supply voltage varies beyond normal limits. This is not just a performance feature. It is a safety requirement.<\/p>\n<p>For system integrators and panel builders, a wide-voltage-range custom power supply simplifies system design. Instead of specifying different power supplies for different track sections or network conditions, a single custom design can cover the entire range. This reduces inventory complexity, simplifies maintenance, and improves overall system reliability.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-15599\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/07\/0714-EA-ELR-10080-60-2U-1500W-Power-Supply-2.png\" alt=\"EA-ELR 10080-60 2U 1500W Power Supply\" width=\"700\" height=\"394\" \/><\/p>\n<p><em>Image Generation Prompt: \u201cWide voltage range railway power supply module with input range selector and thermal management features, shown with technical callouts for voltage range and operating temperature, engineering documentation visible, photorealistic, technical product shot\u201d \u2014 Alt: Wide voltage range railway power supply module with technical specifications<\/em><\/p>\n<p>For a deeper look at TPS&#8217;s custom power supply design capabilities, see our <a href=\"https:\/\/tps-elektronik.com\/en\/custom-power-supply\/\">custom power supply engineering<\/a> guide and <a href=\"https:\/\/tps-elektronik.com\/en\/buck-boost-converter-design-pcb-layout-reliability\/\">buck-boost converter design<\/a> resources.<\/p>\n<\/section>\n<section id=\"surge-immunity\">\n<h2>3. Surge Immunity: Protecting Signaling and Interlocking from Railway Transients<\/h2>\n<p>Surge immunity is perhaps the most critical\u2014and most overlooked\u2014requirement for trackside signaling power supplies. The railway environment is rich with transient events: lightning strikes, switching operations in traction power systems, fault clearing. And inductive load switching all generate voltage surges that can destroy unprotected power supplies.<\/p>\n<h3 id=\"surge-sources\">3.1 Sources of Surges in Railway Environments<\/h3>\n<p>Lightning is the most obvious source of surges, but it is far from the only one. Traction power systems generate significant transients when locomotives accelerate or brake. When pantographs make or break contact with overhead lines, and when circuit breakers operate. Inductive loads\u2014such as point machines and level crossing barriers\u2014generate back-EMF surges when de-energized. These transients can reach hundreds of volts and last for milliseconds, easily exceeding the input ratings of standard industrial power supplies.<\/p>\n<p>EN 50125 addresses these environmental influences, including lightning and electromagnetic compatibility. While the standard defines environmental conditions rather than specific test requirements, it establishes the framework within which power supplies must operate. Compliance with EN 50125 means designing for the full range of environmental stresses\u2014including surges\u2014that equipment will encounter in service.<\/p>\n<h3 id=\"surge-protection\">3.2 Surge Protection Strategies for Trackside PSUs<\/h3>\n<p>TPS Elektronik incorporates multiple layers of surge protection in custom power supply designs for railway applications. Our approach includes:<\/p>\n<ul>\n<li><strong>Input surge suppression:<\/strong> Metal oxide varistors (MOVs) and transient voltage suppression (TVS) diodes at the input stage clamp surge voltages to safe levels.<\/li>\n<li><strong>Galvanic isolation:<\/strong> Reinforced isolation between input and output stages prevents surges from propagating to sensitive signaling and interlocking circuits.<\/li>\n<li><strong>Robust component selection:<\/strong> Components rated for high surge currents and wide temperature ranges ensure long-term reliability.<\/li>\n<li><strong>PCB layout optimization:<\/strong> Careful layout minimizes parasitic inductance and capacitance that can amplify surge effects.<\/li>\n<\/ul>\n<p>For railway signaling applications, surge immunity is not just about protecting the power supply itself. It is about protecting the entire signaling system. A surge that damages a power supply can take down an entire interlocking, point machine, or level crossing, with potentially catastrophic consequences. TPS custom power supplies designed to survive the surge and keep the signaling system operational.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-15324\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/07\/3000VAC-Isolation-48V-Power-Supply-Safety-Diagram-Industrial-\u2013-TPS-Elektronik-3.jpg\" alt=\"3000VAC Isolation 48V Power Supply Safety Diagram Industrial \u2013 TPS Elektronik 3000VAC Isolierung 48V Netzteil Sicherheitsdiagramm Industrie \u2013 TPS Elektronik\" width=\"1920\" height=\"1079\" \/><\/p>\n<p><em>Image Generation Prompt: \u201cRailway power supply surge protection circuit board with MOVs, TVS diodes, and isolation barriers, technician performing surge immunity testing with transient generator, oscilloscope showing surge waveform, professional test laboratory environment, photorealistic\u201d \u2014 Alt: Railway power supply surge protection circuit board under test<\/em><\/p>\n<p>For related design insights, see our <a href=\"https:\/\/tps-elektronik.com\/en\/circuit-breaker-panel-design-software-design-pattern-ecad-mcad-fpga-integration\/\">circuit breaker panel design<\/a> and <a href=\"https:\/\/tps-elektronik.com\/en\/buck-boost-converter-design-pcb-layout-circuit-breaker-innovation\/\">buck-boost converter design with circuit protection<\/a> resources.<\/p>\n<\/section>\n<section id=\"tps-approach\">\n<h2>4. The TPS Approach: Custom Power Supply Solutions for Railway Infrastructure<\/h2>\n<p>TPS Elektronik&#8217;s custom power supply solutions for railway trackside signaling and interlocking are built on an EMS foundation. Every power supply treated as a controlled product with defined process steps, documented testing, and full traceability. Our mechatronics service spans the entire product lifecycle. From concept and design through PCB assembly, box-build manufacturing, and final testing.<\/p>\n<p>Our modular, platform-based approach to custom power supply design is particularly well-suited to railway applications. By utilizing pre-engineered, pre-tested topologies, we deliver customizable power supply solutions that perfectly match specifications while drastically reducing development time and certification risks. The platform approach allows us to adapt proven designs to specific railway requirements. Wide voltage ranges, surge immunity, extended temperature operation, and custom form factors\u2014without starting from scratch.<\/p>\n<p>Key capabilities of our railway power supply service include:<\/p>\n<ul>\n<li><strong>Wide input voltage range:<\/strong> Designs covering 14.4V to 154V DC or broader, accommodating multiple nominal voltages.<\/li>\n<li><strong>Surge immunity:<\/strong> Multi-layer protection against lightning, traction system transients, and inductive load switching.<\/li>\n<li><strong>Extended temperature operation:<\/strong> Components and thermal management designed for -40\u00b0C to +85\u00b0C railway environments.<\/li>\n<li><strong>Galvanic isolation:<\/strong> Reinforced isolation for safety and noise immunity.<\/li>\n<li><strong>Custom mechanical integration:<\/strong> Form factors that fit trackside cabinets, DIN rail mounting, and enclosure requirements.<\/li>\n<li><strong>Full documentation:<\/strong> Test reports, BOM\/revision control, and serialized traceability for compliance and field service.<\/li>\n<\/ul>\n<p>Our power supply development service transitions seamlessly into in-house PCB assembly, testing, and full mechatronic box-build manufacturing. This integrated approach ensures that the power supply designed for the railway environment is the power supply delivered\u2014without the gaps that can occur when design and manufacturing are handled by different vendors.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-15033\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/06\/0724-high-quality-bidirectional-power-module-TPS-BM75053KTIF-S.png\" alt=\"high quality bidirectional power module\" width=\"1024\" height=\"419\" \/><\/p>\n<p><em>Image Generation Prompt: \u201cCustom power supply mechatronic assembly for railway signaling, showing complete box-build with DIN rail mounting, terminal blocks, and surge protection modules, professional EMS manufacturing environment, photorealistic, wide shot\u201d \u2014 Alt: Custom power supply mechatronic assembly for railway signaling<\/em><\/p>\n<p>For more information on our mechatronics capabilities, see our <a href=\"https:\/\/tps-elektronik.com\/en\/case-studies\/custom-power-supply-design-and-battery-test-systems\/\">custom power supply design case study<\/a> and <a href=\"https:\/\/tps-elektronik.com\/en\/battery-test-system-and-custom-power-supply-design\/\">battery test system and power supply design<\/a> resources.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/ems\/mechatronics\/\">Discuss your railway power supply requirements \u2192<\/a><\/p>\n<\/section>\n<section id=\"applications\">\n<h2>5. Applications: From Point Machines to ETCS Lineside Electronic Units<\/h2>\n<p>TPS custom power supply solutions for railway signaling and interlocking serve a wide range of trackside applications:<\/p>\n<p><strong>Point Machines (Railway Point Machine Power Supply):<\/strong> Point machines require high inrush current for motor operation and stable power for position sensing. Our custom power supplies deliver the peak power needed for motor starting while maintaining regulation for control electronics.<\/p>\n<p><strong>Level Crossing Barriers (Level Crossing Barrier Power System):<\/strong> Level crossing systems combine motor drives, control logic, and monitoring\u2014all requiring reliable power. Our power supplies provide the multiple outputs and isolation needed for these safety-critical systems.<\/p>\n<p><strong>Axle Counters (Axle Counter Power Supply Unit):<\/strong> Axle counter systems require clean, stable power for sensitive detection electronics. Our custom designs include filtering and isolation to prevent track noise from affecting counter accuracy.<\/p>\n<p><strong>ETCS Lineside Electronic Units (ETCS Lineside Electronic Unit PSU):<\/strong> European Train Control System (ETCS) trackside equipment demands high reliability and compliance with railway standards. Our power supplies are designed for the environmental conditions defined in EN 50125, ensuring ETCS equipment remains operational in all conditions.<\/p>\n<p><strong>Railway Signaling Battery Chargers (Railway Signaling Battery Charger):<\/strong> Trackside signaling systems often rely on battery backup. Our custom battery chargers are designed for the railway environment, with wide input voltage ranges, surge protection, and temperature-compensated charging.<\/p>\n<p>For each application, TPS works closely with system integrators and panel builders to define the exact requirements\u2014input voltage range, output voltages and currents, mechanical form factor, environmental ratings, and certification needs\u2014and delivers a custom power supply solution that meets those requirements.<\/p>\n<\/section>\n<section id=\"faq\">\n<h2>6. FAQ<\/h2>\n<div>\n<div>\n<h3>What is EN 50125 and why is it important for railway power supplies?<\/h3>\n<div>\n<div>EN 50125 is the European standard that defines environmental conditions for railway equipment, including altitude, temperature, humidity, lightning, EMC, vibration, and shock. Power supplies for trackside signaling and interlocking must be designed to meet these conditions to ensure reliable operation in the railway environment.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>What is a wide voltage range power supply for railway applications?<\/h3>\n<div>\n<div>A wide voltage range power supply can operate across a broad input voltage range\u2014typically covering nominal voltages from 24V to 110V DC or broader. This is essential for trackside equipment because railway power sources can fluctuate significantly due to traction system demands and network conditions.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>Why is surge immunity critical for trackside signaling power supplies?<\/h3>\n<div>\n<div>Surge immunity protects power supplies from transient events such as lightning strikes, traction system switching, and inductive load transients. Without adequate surge protection, these events can damage the power supply and take down signaling, interlocking, or level crossing systems.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>What applications does TPS support with custom railway power supplies?<\/h3>\n<div>\n<div>TPS supports a wide range of railway applications including point machines, level crossing barriers, axle counters, ETCS lineside electronic units, and railway signaling battery chargers. Each application has specific power requirements that our custom designs address.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>How does TPS ensure quality and reliability for railway power supplies?<\/h3>\n<div>\n<div>TPS uses an EMS-based approach with controlled manufacturing processes, 100% testing, and full documentation. Our modular platform design methodology leverages pre-engineered, pre-tested topologies to reduce risk and accelerate development while maintaining high reliability.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>Does TPS provide full mechatronic box-build for railway power supplies?<\/h3>\n<div>\n<div>Yes. TPS offers complete mechatronic integration\u2014from PCB assembly to full box-build manufacturing with DIN rail mounting, terminal blocks, and enclosure integration. We deliver a complete, tested power supply module ready for installation in trackside cabinets.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<footer style=\"background: #2d5797; padding: 30px; border-radius: 14px; margin-top: 40px;\">\n<p style=\"color: #ffffff; font-size: 16px; line-height: 1.6; margin: 0;\"><strong>Ready to develop a custom power supply for your railway signaling project?<\/strong><br \/>TPS Elektronik delivers EN 50125-compliant custom power supply solutions for trackside signaling, interlocking, and railway infrastructure\u2014from design through mechatronic box-build.<br \/><a style=\"color: #ffffff; font-weight: 600; text-decoration: underline;\" href=\"https:\/\/tps-elektronik.com\/en\/services\/ems\/mechatronics\/\">Request your railway power supply consultation \u2192<\/a><\/p>\n<\/footer><\/article>\n\n<style id=\"wpforms-css-vars-4659-block-da268ee9-e746-4be0-9b11-df62fd0c416b\">\n\t\t\t\t#wpforms-4659.wpforms-block-da268ee9-e746-4be0-9b11-df62fd0c416b 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infrastructure face a persistent challenge: trackside signaling and interlocking equipment must operate reliably across a wide voltage range while withstanding surges that would destroy standard industrial power supplies. The railway environment is uniquely demanding. Extreme temperature variations from -40\u00b0C to +85\u00b0C, long-term shock and\u2026 <a href=\"https:\/\/tps-elektronik.com\/en\/what-is-tps-custom-power-supply-solution-for-high-speed-rail-trackside-signaling-and-interlocking-and-why-it-is-indispensable-for-en-50125-wide-voltage-range-and-surge-immunity\/\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":15599,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[58],"tags":[],"class_list":["post-15792","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TPS Custom Power Supply Solutions - TPS<\/title>\n<meta name=\"description\" content=\"Custom power supply solutions for railway signaling and interlocking. 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