amount of room before the front walkway. Many, but not all, N series locomotives have a short electrical box with sharp-angled corners in that location; this is easily distinguished by the lower, longer, rounded-cornered "satchel" of the SC and SW series. The other distinguishing feature from the S series is the central location of the twin exhaust stacks; the S series have them offset towards the engineer's left, because of the inline diesel engine. Pre-NC One experimental locomotive was built in March 1935 as a demonstrator, numbered EMC 518. It was assembled by Bethlehem Steel of Wilmington, Delaware. After demonstration purposes, it was sold to the Philadelphia, Bethlehem and New England Railroad in October as #203, later renumbered to 55; it was later sold to the Parrish Line Railway as their #10. NC Five NC locomotives were built. Some had General Electric electrical equipment, while others had Westinghouse, since EMC's own designs were not yet ready. This model did not have multiple unit equipment. They were: EMC S/N 647:1 (built January 1938): Great Northern Railway #5101 (later #5300) rebuilt to an SW1200 in 1955. EMC S/N 648:1 (built July 1937): Philadelphia, Bethlehem and New England Railroad #208. EMC S/N 649:1 (built July 1937): Philadelphia, Bethlehem and New England Railroad #209. EMC S/N 650 (built May 1937): Youngstown and Northern Railroad #201, to Elgin, Joliet and Eastern Railway #402 in April 1946, to Philadelphia, Bethlehem and New England #55 EMC S/N 651 (built May 1937): Youngstown and Northern Railroad #202, to Elgin, Joliet and Eastern Railroad #408 in April 1946, to Marinette, Tomahawk & Western Railroad #408, then finally to the Sabine River and Northern Railroad as #408 before being preserved in the National Museum of Transportation in St. Louis, Missouri. NC1 Five NC1 locomotives were built during March 1937, all with Westinghouse electrics. The only difference between models NC and NC1 was the fitting of multiple unit connections to the NC1, to enable multiple working. All were delivered to the Birmingham Southern Railroad, as EMC S/N 642-646, BSR #71-75. NC2 Two NC2 locomotives were built in July 1937 for the Missouri Pacific Railroad. They were functionally identical to the NC1; Pinkepank states EMC as recording, enigmatically, "Wiring" as the difference. They were EMC S/N 714 and 715, MP #4100 and 4101. NW Eight NW locomotives were constructed between September 1937 and December 1938. They were identical to the NC except