Ross tied up the Deschutes Hauler East at it's terminus in Pocatello and was promptly coralled by another crew call.
He'd driving the 100, the reefer express east (RXE). There is a special instruction in the timetable making 100 superior to all other trains on the railroad.
RXE has made it through Browning, across the lower Crabtree Creek bridge and is pulling upgrade toward Junction City.
This is an easy train to drive. With every other train getting out of its way Ross only needs to sign registers and make sure 100 doesn't leave any station before the timetable's specified leaving time.