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The backhoe rolls on its frame across the open car. The yellow arms (below) slide down the top of the next car so the backhoe can move down and attach itself to the next car in line. The truck would pull off the full car and it also drove the entire work train down the rails.
You can see how it has moved west onto the next empty car. Then the full car is hauled away. That would be a job I would love to do for a try!