Siemens DTC Frankfurt: CBTC’s Impact on German Rail

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Introduction

Siemens Mobility announced the completion of a year of semi-automated test operations for a digital train control system prototype on a metro train at the Frankfurt Transport Company’s (VGF) central depot in Germany, as part of the Digital Train Control System Frankfurt (DTC) project. VGF plans to begin the phased implementation of the system in 2027.

Project Overview

The DTC project aims to introduce communications-based train control (CBTC) technology to Frankfurt’s rail network. The modified U5 train has been operating at Grade of Automation 2 (GoA2). The CBTC system will enable continuous radio communication between trains and track infrastructure, supporting a “moving block” operation. This approach is intended to allow trains to run at shorter intervals, increasing service frequency.

System Benefits

The new system is expected to improve timetable reliability, reduce energy consumption by up to 25%, and lower wear on vehicles and tracks. It is also designed to provide consistent acceleration and braking. Guido Rumpel, head of Siemens Mobility Rail Infrastructure Germany, stated that the Trainguard MT CBTC technology enables more trains to run at shorter intervals, providing up to 30 percent more capacity with technically possible train sequences of less than 100 seconds, increasing energy efficiency, and significantly improving punctuality.

Integration and Testing

Frankfurt’s metro network includes above-ground sections, necessitating integration with road traffic management. The DTC project is linked with the city’s “Frankfurt MIND(+)” initiative, which uses Cooperative Intelligent Transport System (C-ITS) technology. VGF reports that the interface between CBTC and C-ITS was tested successfully on its test ring. The required technology has been installed on lines U4 and U5 in the tunnel section between Bockenheimer Warte and Seckbacher Landstraße. Static system tests are scheduled for September and October, with initial test runs without passengers planned for January 2026. These tests will include moving block operations as well as stress and load assessments.

Implementation Timeline

VGF expects upgrades on lines U4 and U5 to be completed by 2027. The A-Route, covering lines U1, U2, U3, and U8, is scheduled for completion by 2030, followed by the C-Route and tram network in 2033. In July, Siemens opened its expanded train manufacturing facility in Munich-Allach, Germany.

Conclusion

Siemens Mobility has completed a year of semi-automated testing for a digital train control system prototype in Frankfurt. The project aims to introduce CBTC technology, with phased implementation beginning in 2027. The system is expected to improve efficiency and capacity. Testing includes integration with the city’s C-ITS initiative. The project is scheduled to be completed in phases through 2033.

Company Summary

Siemens Mobility: A company providing transport solutions, including rolling stock, infrastructure, and related services.

Frankfurt Transport Company (VGF): The public transport operator in Frankfurt, Germany.

Technology

Communications-Based Train Control (CBTC): A railway signaling system that uses radio communication between trains and trackside equipment for train control.

Cooperative Intelligent Transport System (C-ITS): A system using communication technologies to improve transport safety, efficiency, and comfort.

Trainguard MT: Siemens Mobility’s CBTC technology.

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