There is some fascinating footage of the Carmarthen to Aberystwyth line and its branches at http://Peoplescollection.wales/items/1400701
My query relates to the operations being carried out from 10.59 to 11.30
Is anyone able to explain the sequence of movements to a complete novice like me, please? We first see 7437 approaching with what looks like four milk tanks and a guards van. The footage then cuts to what appears to be a goods van, open wagon and three milk tanks being backed down the passenger platform, whilst something seems to be located further down the line. Then it cuts to what appears to be the same vehicles with a guards van attached, still at the platform whilst the engine backs down the other platform with milk tanks still attached, before being seen attaching to the front of the train without the milk tanks it was just moving.
My questions are:
why wasn't the train being assembled in the goods yard?
how did the various vehicles appear to change order and position?
how would I know what valid shunting moves are to re-create them on a layout when I have no knowledge of the historical reality?
Apologies for any errors in use of the terms, and I hope that this is the correct place to post this.
Thanks