Simutrans has been released in version 125.0.1 - shortly after version 125.0.

Simutrans is a free, open-source transport simulation where road, rail, air and ship networks are built and managed.

The update brings emergency bugfixes: keypress commands did not work on SDL2, and a crash occurred when double-height bridges changed to single height. Bridges on straight constructions were also improved, and underground lines now work in sliced underground mode without tunnel portals.

Emergency bugfixes: No keypress commands on SDL2 (ups) and a crash when double heigth briges go to single height. Additionally, improvements for bridges on straight constructions and underground lines without tunnel portals in sliced underground mode.

Source: SourceForge