railway vehicles railway transport 127 history 35 locomotives 24 railway lines 22 car trucks 20 electric traction 16 more ... construction 16 rails 13 railway structures 12 simulation and modelling 11 mechanical engineering 11 trolley cars 10 line locomotives 9 models 8 traffic safety 7 electric drives 6 urban rail transport 6 steam locomotives 6 tramway transport 6 dynamics 5 mathematical models 5 optimization 5 testing of machines 5 maintenance 5 brake systems 4 means of transport 4 machine parts lubrication 4 underground (transport) 4 repairs 4 less ...