So while probably not the most requested locomotive for the new Clinchfield Route, a good loco DLC for it would be General Electrics U36C. The U36C was one of GE's last U-Boats offered, being built between 1971 and 1975. They produced 3,600HP. The Clinchfield was one of the railroads that purchased the locomotive, a total of 7, numbered 3600-3606. 2 major purchasers of the loco were Ferrocarriles Nacionales de Mexico (N de M) and the Santa Fe (104 and 100). This locomotive actually shouldn't be too hard to make for Dovetail either, as it it relatively similar to the U36B which we already have in game, with the major differences being the frame length, lights and truck type (B-B vs C-C) https://store.steampowered.com/app/277757/Train_Simulator_Seaboard_GE_U36B_Loco_AddOn/ Post merger these locos still ran with the Seaboard Coast Line/Seaboard System, with even a few surviving into the CSX era. So maybe these can come in 4 paint schemes for the DLC. Clinchfield Seaboard Coast Line/Seaboard System CSX