Monongahela leading 776. Well...uh...no. Though DPU's are the norm everywhere else. They are just recently making appearances on the slopes of the Allegheny ridge. And, so far, to a limited extent. As manned units still make up the majority of the slope helper power. Here 8025 along with an AC44C6M push a "black snake" past MP 258.8 just one day before the sad removal of all the PRR signals from MO(mountain) to SO(south fork).