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TheWestern Maryland J-1 class, also known as thePotomac, was a class of twelve4-8-4 "Potomac" (Northern) typesteam locomotives built by the Baldwin Locomotive Works in 1947. They were operated by the Western Maryland Railway (WM) in revenue service until the mid-1950s. Like most railroads in the South, the WM did not choose the more common name "Northern", going with the name "Potomac" for their 4-8-4s instead.
They were built to haul freight on the WM mainline and all were retired by 1954.
TheWestern Maryland Railway (WM) was the last North American railroad to adopt the4-8-4 "Northern" type, and as a railroad that primarily ran within theSoutheastern United States, the WM chose to call their 4-8-4s "Potomacs", as named after thePotomac River. These new locomotives were the last new steam locomotives the WM purchased, and as such, they were very modern, efficient and powerful, as well as having relatively largeboilers. They also heldTimkenroller bearings on everydriver andtender axle and on the back end of theeccentric rod. All link motion pins used needle bearings.[1] When running at forty-five miles per hour, the "Potomacs" had nearly the same performance as the larger M-2 class4-6-6-4 "Challenger" types.[2] On the 1.75% grade west out ofCumberland, Maryland, the Potomacs were limited 1,180 tons unassisted.[3] On level trackage, they were capable of running upwards while pulling 5,500 tons, with an 8,000-ton limit for downhill journeys.[4]
Due to coming when most railroads were starting todieselize, the "Potomacs" did not have long careers, being in service for only seven years before being retired and put into storage inHagerstown and Cumberland in 1954.[5] They remained there until 1957, when the equipment trusts ran out and were subsequently scrapped. None of the J-1s have been preserved.[6]