Here is a line to a 5 minute video of a Plasser machine removing old track and laying concrete sleepers and weld rail. Guided by men but the machine does all the work. See it here http://www.flixxy.com/train-laying-track.htm
This is Alien3's plassers in action.
plasser 1,<kuid:119692:10>
plasser 2,<kuid:119692:11>
plasser 3 front,<kuid2:119692:12:2>
plasser 3 mid,<kuid2:119692:13:3>
plasser 3 end,<kuid2:119692:14:4>
plasser 6,<kuid:119692:18>
plasser 5,<kuid:119692:20078>
Bob
This is Alien3's plassers in action.
plasser 1,<kuid:119692:10>
plasser 2,<kuid:119692:11>
plasser 3 front,<kuid2:119692:12:2>
plasser 3 mid,<kuid2:119692:13:3>
plasser 3 end,<kuid2:119692:14:4>
plasser 6,<kuid:119692:18>
plasser 5,<kuid:119692:20078>
Bob