The conductor rides the tail engine of the now light power of CSX Z437 (aka MMID UBHF) in preparation of throwing the switch to line back up with the main.
The conductor climbs aboard the step of the rear engine of CSX Z437 (aka MMID UBHF) after uncoupling the cars from the engines at the CSX/MMID interchange.
The engineer climbs back aboard Engine 305 after moving some items to the trailing engine (#303), which will shortly become the leader of CSX Z437 (aka MMID UBHF) for the return to Union Bridge.