The mechanical stoker, used on most standard-gauge mainline locomotives and mountain railroads, was developed in 1905 for the Pennsylvania Railroad's Appalachian division between Harrisburg and Juniata, Pa.—fittingly, on Pennsy's 2-8-2 Mikados. The steam-powered auger type, a large Archimedes-screw stoker, which crushes and transports coal from tender to fire, was perfected around 1915. D&RGW's 45 narrow-gauge Mikados were too small to require stokers.