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Mechanical powertrain refers to mechanical systems that set a vehicle in motion. This includes internal combustion engines, transmission systems, steam boilers and so on. Mechanical powertrain damage may occur as a result of collisions, but also due to improper operation of a vehicle. Lack of lubrication, or most commonly, transmission oil overheating may cause severe damage, and even catastrophic failure, immobilizing the vehicle and potentially causing body damage too.
A {{pll|Rail Vehicle Types|vehicle's}} mechanical {{pll|Powertrains Overview|powertrain}} subsystem consists of non-electrical components, such as {{pll|Internal Combustion Engine|diesel engines}}, {{pll|Steam Overview|steam engines}}, {{pll|Mechanical Transmission|mechanical}} and {{pll|Hydraulic Transmission|hydraulic}} transmissions.
