Something, possibly in a recent update, has disabled the dynamic brakes on all EMD locomotives, making it impossible to enjoy SPG and Penn Corridor.
It was the March 2 patch, which didn't update Sand Patch or PC themselves, and weirdly it only affects EMDs, not GE or European engines. My guess is that something they did in the core in preparation for Clinchfield is responsible.
Answered by Adam in another post (which I believe you were a respondent to) so hopefully being looked into now