Sitching problems Uintah Railway

What is everybodys best gues ( and with out a map its harder to describe)
Scenario one : Early Watson Utah on the Uintah Railway.
A one car passenger train aproaches from the south heading north towards Rainbow Junction and Watson needing to deliver it passengers to the deck of the Watson depot. Rainbow Junction was a wye on the main line and one "tail" of the wye went on down the canyon to Watson a little more than a half mile away. The tracks at Watson was a dead end with no through siding. All photos of Watson show the passenger train with the engine heading south, back towards the wye. So in this scenario would it seem more likely that they turned the entire train at Rainbow Junction and backed in to Watson? Or would they have uncoupled from the passenger car at the wye, turned the engine, coupled back up and then backed to Watson? Is there any known reason why they would have went to the extra trouble of uncoupling, just to accomidate the passengers?
Scenario two : Watson in the 1920's and 1930's.
After installing a through siding at the Watson depot all photos still show the passenger train heading south, back towards the wye. Would you think thay they operated it just like they had earlier, or did they pull in to the depot, uncouple, move forward to the switch, back past the passenger car to Rainbow Junction wye, turn the engine, back down to Watson and recouple? Still seams easier to just turn the whole train at Rainbow Junction - maybe I'm making things to complicated, but why did they decide to add the through siding in front of the depot?
Any thoughts aprriciated.