Modifications are understood as the tasks associated with changing the original characteristics of the vehicle as manufactured in order to improve certain aspects for more efficient operation.
The maintenance required to restore the vehicle's functionality following an unexpected malfunction of the vehicle's components, circuits, etc., such as the replacement of a traction engine.
This diagnostic equipment is based on the thermodynamic analysis of diesel engine cycles while charged, which is achieved by applying resistances to the electric generator.
One of the fundamental aspects of rail maintenance is controlling the wear on the wheel rims in contact with the track. This can be verified by checking the condition of the profile compared to the nominal for the vehicle in question.