iR | DB BR 423 - S-Bahn Köln & Stuttgart Repaints

⚠ Important Notice
The 02/04/26 update to the Stuttgart-Heilbronn route has unfortunately caused Addon-Manager issues with our S-Bahn Stuttgart repaint, due to which the repaint may not work or crash the game. To our knowledge, the S-Bahn Köln repaint is unaffected.
See the "Known Issues" section for more details.

These two mods finally add proper S-Bahn Köln and S-Bahn Stuttgart 423s, something that has been infuriating to us, and you too, probably. We've added the proper appropriate PIS displays to both the inside and outside, swapped out the decals for the correct ones, did various changes to the cab and to the interior, and also added our own functional EBuLa!

We hope you enjoy this as much as we do! :D

Features

This list only contains the most notable additions of this mod important to players. For more details on any and all features in this mod, consult the changelog below.

• Added both S-Bahn Köln & S-Bahn Stuttgart repaints based on the Frankfurt S-Bahn 423
• Added S-Bahn Köln 423 246 "Genauso bunt wie ihr" repaint
• Added rudimentary but functional EBuLa
• Replaced entire PIS setup
• Added functionality to the cab window & microphone
• Changed cab & interior models appropriately
• Some smaller model & texture changes
• New door sounds
• Repaints appear in their appropriate timetables (Frankenbahn & Köln - Aachen)

Known Issues

• The 02/04/26 update to the Stuttgart-Heilbronn route has unfortunately caused Addon-Manager issues with our S-Bahn Stuttgart repaint, due to which the repaint may not work or crash the game. To our knowledge, the S-Bahn Köln repaint is unaffected. We haven't found a fix yet, though we will continue investigating. No workaround is known, therefore we ask you to uninstall that repaint for the time being. Sorry!
• The PIS displays cannot be overridden as our system is separate from the original one. We will be fixing this in a future update once our core systems allow this.
• The S-Bahn Stuttgart 423 is inappropriate for the era of the currently available Frankenbahn timetable. We're hoping to add another repaint fitting the 2000s in the future :)
• The S-Bahn Köln repaint may be incompatible with Myron's 423 sound mod. We cannot test nor potentially fix this as the mod has been taken down. If you have it installed and have issues with the repaint, try uninstalling the sound mod first.

Found issues? Want to contact us?

If you come across any issues or inaccuracies with this mod, or if you'd like to ask us something, please reach out to us, either by leaving a commment on this mod page, or by pinging someone from our team on the Train Sim Community Discord! We'll be dealing with it as soon as we can!

Support this Project

If you like what you're seeing from us and would like to financially support us and our work (we're mostly still students, after all), you're more than welcome to do so on Nagi's Ko-fi page! It helps us with making new stuff, be it with us able to put more time into development, or with us being able to buy new equipment for even better stuff. We'll fairly split any donations between our team :)

Also, anyone contributing 5€ or more may be added to the list of supporters below!

Monthly supporters (i.e. First Class members through Ko-fi memberships) may be listed on all mods released or updated during the period of their membership and the next mod or mod update after the end of that period.
One-time supporters may be listed on the next mod or mod update after the donation.

Brought to you by Hannah & the iR Team
Version v1.0.2 – released 27/01/2026

last updated 27/01/2026

Tags: br-423 frankenbahn schnellfahrstrecke-koln-aachen