The MRS-1 (Military Road Switcher 1), built for the US Government, was actually two types of locomotive. One built by Alco and the other by EMD, they had similar specifications. Both were light 6-axle engines with variable-gauge trucks and small overall dimensions. Both of these characteristics were to permit operation overseas. Most other countries have smaller loading gauges than the USA, Canada and Mexico. The Alco and EMD MRS-1s are quite distinct. Alco MRS-1s: http://railpictures.net/viewphoto.php?id=93066 http://railpictures.net/viewphoto.php?id=125069 http://railpictures.net/viewphoto.php?id=112939 http://www.rr-fallenflags.org/usa/usn6500554ass.jpg http://www.rr-fallenflags.org/usa/usa-b2041ags.jpg http://www.rr-fallenflags.org/usa/usa-B2043agc.jpg http://www.rr-fallenflags.org/usa/usa-b2083ags.jpg EMD MRS-1s: http://railpictures.net/viewphoto.php?id=89402 http://www.berail.be/usa/emd_images/1818ge2.jpg http://railpictures.net/viewphoto.php?id=134880 http://www.rr-fallenflags.org/usa/usn0573als.jpg http://www.rr-fallenflags.org/usa/usn0570als.jpg Both types of MRS-1 have high walkways. EMD MRS-1s have a peaked roofline and a fuel tank divided in two. Alco MRS-1s have a large raised grille like an early RS-series, a single rectangular fuel tank, battery boxes under the cab, and sometimes a tall stack. Handrails on both types are variable and often nonexistent.