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@edscoble
In the past, they usually shunts wagons together to transport them from A to B (they use to have huge shunt yard all over the country for this purpose), but nowadays we have 'block train' without needing to spilt up, resized, etc. eliminating the need for shunting, the same goes for passenger train which have a multiple units (like the Eurostar for example), which is why the cost is too high to simply shunt together a train specificity for the DD.
However in the past, it wasn't uncommon for the railways to simply add one more carriage if there's too many passenger at the next stop, hence why in the past you can have those easily without extra cost.