While riding train 215 I was able to photograph the engine change that is being done at Osier between the 463 out of Antonito and the K36 coming out of Chama. Normally train 216 arrives in Osier about 20 minutes ahead of 215.
The process begins once 216 has arrived with its engine cutting off and running around the balloon track and moving back past the west switch. Once 215 arrives it stops short of the east switch and 463 cuts off.
463 then moves forward past the east switch and the crew align the switch for the balloon and 463 backs in.
The engine off 216, in this case 487, now backs down onto 215.
487 now couples to the train and begins its standing air test.
While the brake test is being done 463 continues around the balloon track.
Standing brake test done, the 487 gets train 215 moving to the Osier lunch stop.
While 487 was doing its standing brake test the 463 has backed down to train 216 and done the same.
So by the time train 215 makes it into the Osier lunch stop, train 216 is also ready to depart once lunch is over.