Hotkeys:
toggle driving mode of selected train (CONTROL + R default). Mouse over a locomotive, cargo wagon, fluid wagon, or artillery wagon.
toggle driving mode of train we are in! Spacebar by default.

Player settings to enhance driving manually and automatically:
exiting a train can switch it from automatic to manual
if we grabbed a train and we are at a temporary stop, switch back to manual?
if we YEET from a moving train, let it go or switch it to manual?