Thumbs up for the level of detail you are putting into this. Are you doing this all on your own? Such a massive job!
Diesel starting air tank
The diesel engines were started and reversed using air tanks. Each diesel engine had a 125L air tank holding air at 30 atm. For the latest release, I've added the simulation aspects to use air to start or reverse the engine. For now, no main air manifold is present so the tanks will not refill. After a single start, they will fail to restart again.
Double click the diesel motor to get more info on the engine and specs. As I dive deeper into the sim, more of the underlying components will be made interactible on the 2d schematic.