sentences:  A Ukrainian built trolleytruck started service in Pleven, Bulgaria in 1987, but that truck may no longer be in service since it is stored in the trolleybus depot.The Québec Cartier Mining Company used trolleytrucks in its iron ore mine in Québec from 1970 until 1977 when the iron ore deposit was exhausted and the mine closed down.The power supply for this remote mine was a power plant taken out of a diesel electric railroad locomotive.