trains railway transport 24 history 10 locomotives 5 railway lines 4 railway vehicles 3 railroad buildings 3 more ... railway traffic 3 railway stations 3 railway structures 3 classical mechanics 2 velocity 2 communications 2 assessment 2 forming of trains 2 high-speed train sets 2 military transport 2 military operations 2 geographical position 2 Ethernet 1 IP 1 wind tunnels 1 aerodynamics 1 automation 1 automated information systems 1 safety 1 engine-sheds 1 active current 1 electronic circuits 1 electronic regulators 1 less ...