Norfolk and Western M Class
…Some later converted to Baker Valve type 12-inch (300 mm) piston valves Performance figures Tractive effort 40,163 lbf (178.65 kN) Career Operators Norfolk and Western Railway Class M Numbers 375–499 Nicknames Mollies Retired 1926 - 1958 Preserved Two (Nos. 475 and 433) preserved, remainder scrapped Disposition No. 475…