The approach (yellow) signal at east Leyden is an indication that the maintenance window on the Moffat hasn't quite come to a close! This train will hold the main at Leyden for a bit until maintenance has cleared up.
One thing to note is the signal itself. The signals at east Leyden are the only signals from the DRGW days (save for the signal bridge at Utah Junction) that have not yet been replaced.
