In general options, enable the Locomotive toggle to unlock cab and audio settings. Bells & Addons:

Train modding official guide - Rolling Line - Steam Community

is an update that focuses primarily on advanced modding features for steam engines, custom 3D model toggles, and improved freight simulation. This "deep guide" covers the core mechanics of the update and the essential systems for both casual layout building and advanced locomotive customization. 1. Update Highlights (v4.25.10)

Users can define custom meshes for different cargo types (coal, wood, scrap) and toggle them manually.

New 3D steam effects include cylinder release when starting/stopping and manually twistable valves in cabs to toggle these effects. 2. Core Controls & Interaction

This version refined the modding overhaul introduced in earlier 4.x patches.

Right-click the "no loco" indicator on a hand-held controller to target a train with a laser, bringing up the Steam Flyer interface.

Beyond standard headlights and cab lights, there are now 4 extra custom control layers for specialized lighting.