Working vehicle for track building, e. g. building fundaments for signal- and catenary system. Equipped with rotating mixing drum and integrated function decoder for DCC/MM and analogue mode. Function of mixing drum in digital mode switchable and in analogue mode constantly working only while driving into one direction. With standard shaft for couplers and mounted system couplers attached. Metal wheels. Dimensions: Lob 15,8 x W 3,6 x H 5 cm.