====== Energy of vehicles ======

Defines the energy used by the vehicle, parameter engine_type. A vehicle using engine_type=electric will need catenary to run.

|**internal name**  |**description **  |
|bio |animal traction |
|sail |sail |
|steam |steam |
|diesel |diesel |
|electric |electric |
|hydrogene |hydrogene |
|fuel_cell |fuel cell |
|battery |battery |