 The 1958 roster shown below is probably representative of FEMRR motive power through the mid-1960s, though a few newer locomotives replaced some older ones listed here, particularly as steam was phased out.Of particular interest to many observers were the Military Road Switchers designated MRS-1 and built specifically for the US Army Transportation Corps.These engines were constructed by the Electromotive Division of General Motors and by the American Locomotive Company (Alco) with trucks that could adjust to accommodate selected track gauges between and broader gauges up to .