Modernization of Existing Fleet: Redesign of 99 S-Bahn Trains on the Rhineland S-Bahn Network

Skip to Content
Career Contact
99 S-Bahn trains of the ET423 and ET422 series are being comprehensively modernized for the Rhineland S-Bahn network to bring technology, comfort, and passenger information up to the latest standards.

Background: New Contracts, Existing FleetWith the re-tendering of S-Bahn services in the Rhineland, the existing trains were to remain in operation but needed to meet new contractual requirements. Instead of purchasing new vehicles, 63 ET423 and 36 ET422 trains are being modernized to improve operational reliability and passenger comfort.

Role of DB Systemtechnik: Engineering, Approval, and Overall Technical ResponsibilityDB Systemtechnik takes full technical responsibility for the project, including:

The image shows a colleague from DB Systemtechnik inside an S-Bahn train during refurbishment work.
The image shows a colleague from DB Systemtechnik inside an S-Bahn train during refurbishment work.
Copyright: DB / DB Regio
  • Defining technical requirements and preparing tender documents
  • Supporting prototype and series refurbishments
  • Managing the approval process for both train series

The goal is to deliver solutions that are both functional and approval-compliant within tight timelines.

Technical Implementation: Targeted RedesignProven systems are retained while selected components are upgraded:

  • New exterior livery and interior design (seat upholstery, handrails)
  • Retrofitted power outlets, USB ports, and Wi-Fi
  • New FIS modules, destination displays, and preparation for FIS/RIS Level 2

This approach ensures a modern look and enhanced functionality without extensive structural modifications.

Integration of New FIS SystemsA key technical challenge is upgrading the passenger information systems (FIS), which control destination displays, interior screens, and dynamic passenger information, all closely linked to train control technology.

The image shows the modernized interior design of the Rhineland S-Bahn.
The image shows the modernized interior design of the Rhineland S-Bahn.
Copyright: DB / DB Regio

The goal is to integrate new hardware and extended features without triggering full vehicle re-approval. This requires careful system integration, precise documentation, and close coordination between engineering, refurbishment teams, operations, and approval authorities.

The result is a modern, high-performance passenger information system seamlessly embedded in the existing system landscape.

Benefits for Operators and PassengersFor operators:

  • Continued use of proven vehicle platforms
  • Minimal adjustments for maintenance and training
  • No major changes to workshop processes

For passengers:

  • Modernized train design
  • Wi-Fi and power outlets
  • Enhanced passenger information
  • Highlight: updated entry lighting

Project SuccessDespite changing requirements and tight schedules, the modernized trains were approved on time thanks to meticulous schedule management and close team coordination.

ConclusionThe modernization demonstrates that existing fleets can be efficiently and effectively upgraded—technically, functionally, and aesthetically—while remaining operationally and economically viable.

This might also interest you

Engineering, Redesign and Refurbishment

Engineering Redesign and Refurbishment
More information