railway vehicles railway transport 125 history 35 locomotives 20 car trucks 20 railway lines 18 electric traction 15 more ... construction 15 railway structures 14 rails 13 mechanical engineering 11 simulation and modelling 10 trolley cars 10 models 9 line locomotives 9 traffic safety 7 electric drives 6 urban rail transport 6 steam locomotives 6 tramway transport 6 mathematical models 5 optimization 5 testing of machines 5 maintenance 5 brake systems 4 means of transport 4 dynamics 4 machine parts lubrication 4 underground (transport) 4 repairs 4 less ...