To see the helper set cutoff on the fly skip to 12:35
The CSX Mountain Subdivision which runs between Cumberland MD and Parkersburg WV is one of the steepest mainline grades in the east averaging between 2%-3% in sections between Grafton and Terra Alta. Due to majority of traffic being coal and the steep grade, helper sets are called out to help shove the heavy trains over the hill. Even with 5 AC gevos in a 2-1-2 power configuration, its still a struggle to take a 100 car train to the top.
CSX C785
CSX 3306 ET44AH Nathan K5HL
CSX 3334 ET44AH
CSX 3239 ES44AH mid train DPU
CSX C789
CSX 3267 ET44AH Nathan K5LA
CSX 748 ES44AH
CSX 3406 ET44AH mid train DPU
CSX H110 Helper Set
CSX 3381 ET44AH
CSX 3421 ET44AH Nathan K5LA
0:00 C785/H110 West End
8:34 C785/H110 Terra Alta
13:28 H110 Graveyard Curve
14:29 C789/H110 Tunnelton
18:25 C789/H110 Rodemer