The DT-6-6-2000 (or DT66-2000, DT-6-6-20, etc.) was a rather unpopular locomotive built by Baldwin. It was a dual-prime-mover engine for transfer service, back in the days when dedicated transfer engines were being built. Its general appearance - a massive 6-axle centercab - makes it impossible to confuse with anything other than a Baldwin RT-624 or Lima T-2500 (threads on those to follow). http://www.rrpicturearchives.net/showPicture.aspx?id=219383 Santa Fe DT-6-6-2000s, as built. Note: Large side sills. Step up in walkways. Headlight high on nose. Grille on end of hood in low position. Typical Baldwin-style trucks with inboard axles closer together, unlike most 6-axle engines. One exhaust stack per hood, near cab. http://www.rrpicturearchives.net/showPicture.aspx?id=343980 Minneapolis, Northfield & Southern DT-6-6-2000. The same identifying features are more clearly visible, except the side sills have been removed. http://www.northeast.railfan.net/images/ccr2000.jpg Baldwin demonstrator. Some DT-6-6-2000s looked slightly different: http://www.northeast.railfan.net/images/prr8954.jpg Pennsylvania Railroad. Note: Grille on end of hood in middle position. No side sills. http://www.rr-fallenflags.org/soo/soo397ads.jpg Soo Line, ex-Duluth, South Shore & Atlantic. Note: Grille on end of hood in middle position, partly plated over. No side sills. http://yardlimit.railfan.net/baldwindiesels/trona/trona50.jpg Trona Railway. Note: Grilles on end of hood in middle and high positions. Two headlight casings. http://yardlimit.railfan.net/baldwindiesels/peabody/peabody50.jpg The same locomotive after being sold to Peabody Coal. I believe these were the last of the big centercabs in regular service, lasting until 1977. http://www.rrpicturearchives.net/showPicture.aspx?id=358495 Elgin, Joliet & Eastern DT-6-6-2000 rebuild. Both engines have been replaced by EMD. The new hoods are lower and wider than the original Baldwin hoods; note how they had to adapt the engine to fit them. Two exhaust stacks per hood. Large grille on front of hood. http://yardlimit.railfan.net/baldwindiesels/eje/eje704.jpg Different EJ&E DT-6-6-2000 rebuild with two Baldwin 1200-hp engines. http://yardlimit.railfan.net/baldwindiesels/magazine-1946-4/index.html Prototype DT-6-6-2000 built for EJ&E. Note the lack of end platforms.