Operating Your Engine
Engines require power to move them. Steam engines require coal and diesel trains need fuel. Trains are extremely efficient so a little bit of power goes a long way. You can interact with a steam or diesel engine to open the control panel which lets you control the throttle. When dismounted from the engine you have to crouch-interact to open the control panel. The Handcars only fuel source is you!
Coupling System
For trains to be coupled all the rolling stock need to face the same direction. Trains can be coupled by driving a engine backwards to couple or forwards to shunt. Rolling stock can be uncoupled from the stock ahead of it by hitting it.
Look at the connectors between the rolling stock, one should face flat and one should be vertical, this is how you know they're able to connect!
Train Horns
Each engine has a unique horn that can be used to signal your approach to a junction or station, scare away mobs roaming on the track or just to be that one friend that blasts it constantly.
Use the horn by pressing jump whilst operating the train.