Railway program of the Mihajlo Pupin Institute is the newest in our portfolio. We are committed to offering top-quality products and solutions and excellent service. The product range intended for use in railway is the answer to railway operators needs to improve rail safety and security and to minimize implementation and maintenance time at the same time.

The main railway products are:

 Axle Counter BROS is used to control occupancy of the railway sections. The device is placed into a standard 19-inch 3U height rack and it is mounted inside the relay room of the railway station, automatic block system, or level crossing.


Axle Counter BROS uses sensor pairs (SP) at the end of each section and it counts in axles that have entered the section, and counts out axles that have left the section. Sensor pair consists of two sensors (wheel detectors) which are placed next to each other on the rail.

In addition to the basic function of detecting the presence or the arrival of the train wheel, sensor pair also provides detection of the direction and speed of rail vehicles.

Key features


Providing outputs for 8 sections and having up to 12 directly connected sensor pairs, BROS device is perfectly suitable for usage within station interlocking system, as a relatively small number of devices can control all sections of the small, medium or large railway stations.

BROS device provides larger number of sensor inputs and relay outputs per one rack compared to competitor devices.

In the case using BROS for controlling occupancy within ABS, only two wires in STA cable is enough for communication with adjacent axle counters.

BROS has two modems, which enable communication with maximum two neighboring axle counters, which is important for usage within ABS.

BROS supports all section topologies. Configuration stored in non-volatile memory provides all possible combination between sensor pairs and relay outputs.

Additionally, direction and system information of the counting heads can be output via optocoupler.

Design of the BROS device is based on cutting edge technology.


More information about BROS Train Axle Counter >>>>> Axel Counter BROS2022 – EN

UTD is a detector device used for reliable and accurate train wheel detection and designed for simple installation and maintenance. It can operate in parallel with any other rail device enabling infrastructure modernization through regular maintenance (e.g. UTD can operate in parallel with magnetic or any other wheel detector at the same detection point).

UTD can operate in parallel with any other rail devices enabling infrastructure modernization through regular maintenance (e.g. UTD can operate in parallel with Magnetic or any other wheel detector at the same detection point).

Once installed as a rail crossing detector, at a later stage, it can be integrated into axle counting system, again reducing the cost of section control modernization.

UTD is designed to achieve maximum wheel detection speed of 300km/h.


More information about UTD >>>UTD 2022 – EN v2

Today convencional signals with light bulbs are replaced by LED lights to reduce energy consumption and maintenance costs. Institute Mihajlo Pupin developed LED light source (LL-70-m, LL-100-m, LL-136-m, LL-160-m, LL-200-m, LL-210-m, LL-136-m KS) intended for use in railway colour light signals as a replacement for two-filament light bulbs in legacy, relay-based interlocking systems, as well as a light source for signals in modern, electronic-based interlocking systems. It is comprised of seven individually controlled and monitored LEDs  and can operate in three different modes: day-time, night time and blinking operation.

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Due to the complex operating requirements of a relay interlocking, LL-000 implements a modular and flexible design capable of supporting wide range of operating conditions, applicable on different types of interlocking systems.

When used on the SpDrS-64, LL-000 doesn’t require any modifications on the interlocking system, other than replacing light bulb housing with LL-000 or replacing just light bulb with LED module. This use case has been successfully proven on Serbian railways where more then 200 pcs. of LL-000 signals were installed on Raiway corridor section Pancevacki Most – Pancevo main station (Republic of Serbia).

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Main advantage of LED signal over incandescent light bulb signal (for SpDrS-64 or any other relay based interlocking systems) is considerably longer life time and availability, which greatly reduces maintenance cost.

A version of LL-000-EI was also developed to satisfy different electronic interlocking requirements. More than 250 pcs. of LL-000-EI signals were installed in Pancevo main station (both LL 136 EI and LL-70-EI) for purposes of integration with electronic interlocking SML 400.

This use case proves the advantage of the modular design, as it reduces cost of adapting LL-000 to different kind of interlockings.

Light source of LL-000 consists of seven individually controlled and monitored high current LEDs. Each LED has its own small, narrow beam lens, which greatly simplifies inner mechanics of LL-000 and proves that bulk glass lens and light bulbs are not necessary.

Due to the fact that LL-000 uses colour LEDs, colour filters are also not necessary. This also means that colour phantom signals are not possible.

 More information about Railway LED signal >>> Railway LED signal 2019- EN

LED railway indicator signal IND-00 ( IND-01 and IND-02) is developed specifically to provide alphanumeric characters and symbolic drawings, as addition to main railway signal. It can also be used for metro and trams.

Due to the complex operating requirements of a railway relay interlocking, IND-00 implements a modular and flexible design capable of supporting wide range of operating conditions, applicable on different types of relay interlocking systems, too. LED indicators IND1 and IND2 reduces cost of adapting railway indicators to different kind of interlockings.

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More information about LED indicator signal >>>> pdf1-6419878

The basic idea of interlocking system is to secure a safe journey of trains and avoid risk of conflicting movements through an arrangement of tracks such as junctions or crossings. And we, at the Mihajlo Pupin Institute, designed MMI10 –  safety HMI (Human Machine Interface) system for administrating, monitoring and controlling one or more railroad interlocking devices. It provides a graphics-based visualization that makes railroad standards compliant with user interface, safe and easy to use at the same time. It’s highly customizable and available in different languages.


More information about MMI10 HMI >>>>  pdf1-4540165

Primary function of m2SCD device is implementation of railway signal interlocking on four routes.

Basic configuration of the device supports control and driving of four signal lights and four announcing signals.

Device can be configured to control lower number of entrance routes or expansion for greater number of routes. In that case all descriptions can be expanded on additional entrance routes.

Complete equipment is placed in standard 19“ industrial rack enclosure. Complete device consists of: batteries, battery charger, inverter for signal power supply, axle sensors and logic for signal interlocking and entrance route enabling and clearing.

Control panel is used to set and clear entrance route and to display signal, sensor and system state. Control panel is freely movable and can be placed in the closed or on the appropriate traffic control desk independently from the rack enclosure (this has to be defined in project documentation).

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More information >>>>> Mini m2SCD – EN