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This is a continous welded rail (CWR) train in Portage la Prairie, MB late May 2000.
This photo shows the welder module and the end from which the rail is paid out. In all three photos, a single rail can be seen passing from the CWR cars, through the welder to the payout end. At the time of this photo, there was only a single rail on the train. At the end of the train (past the CWR cars), there was an empty bulkhead flat, and then an interesting box car 73814.
Conjecture: Rail is drawn off the CWR car into the welder, possibly by winches on the welder. In the welder, it's joined to the previous section and then is pulled off the train as the train moves forward. In these photos, rail would move towards the left as the train train moves toward the right.