there are a lot ways to run the system if you look at the front of your truck it may have a hydraulic pump couple directly to the engine,running load sensing pump, though valving made up of joystick controller using travel limit switch cylinder control so pull lever engine with be sent signal...
in the usa the genset loco looks to be the way to go, made up of smaller engines dr in ac/alternators that can be shut down as require .in Europe the electric/diesel locomotive being diesel electric/electric loco using both on diesel-and over head wiring for power