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Tuesday, February 16, 2010

Railroad T-Shirt - AT&SF (Santa Fe) SD70Ms at San Francisco Peaks - Sizes Kids Small To Adult XXXL

The EMD SD70 is a series of diesel-electric locomotives produced by the Electro-Motive Division of General Motors beginning in 1992. Over 4000 locomotives in this series have been produced, mostly of the SD70M and SD70MAC models. All locomotives of this series are hood units with C-C trucks. All SD70 models up to the SD70ACe and SD70M-2 have the HTCR Radial truck, rather than the HT-C truck; the self-steering radial truck was designed to allow the axles to steer in curves, reducing wear on the wheels and railhead. With the introduction of the SD70ACe and SD70M-2, in an effort to reduce cost EMD introduced a new bolsterless non-radial HTSC truck as the standard truck for these models. The radial truck, now the HTCR-4, is still an option.

The SD70M has a wide nose and a large comfort cab (officially known as the "North American Safety Cab"), allowing more crew members to ride comfortably inside of the locomotive than the older standard cab designs. There are two versions of this cab on SD70Ms, the Phase I, which was introduced on the SD60M, and is home on the SD80MAC & SD90MAC's and the Phase II, which made a return to a more boxy design a la the original 3 window SD60M cabs. Though the Phase II cab has a two piece window matching the Phase I cab windows, the lines of the nose are boxy, with a taller square midsection for more headroom. The SD70ACe/SD70M-2 line has what is considered the Phase II cab, but it is actually more so a Phase III cab, as the windows went from the teardrop design to a rectangular window. Like the SD70, the SD70M also uses DC traction motors. Starting in mid-2000, the SD70M was produced with SD45-style flared radiators allowing for the larger radiator cores needed for split-cooling (split-cooling is a feature that separates the coolant circuit for the prime mover and the circuit for the air pumps and turbocharger). There are two versions of this radiator, the older version with two (2) large radiator panels per side, and the newer style with four (4) square panels per side. This was due to the enactment of the EPA's Tier I environmental regulations. Production of the SD70M was replaced by the SD70M-2 in late 2004, as the EPA's Tier II regulations went into effect on January 1, 2005. 1,646 examples of this model locomotive were produced. SD70M models were produced with 4000 horsepower (2,980 kW) EMD Model 710 prime movers. Purchasers included CSX, New York Susquehanna & Western (part of EMDX order #946531), Norfolk Southern, Southern Pacific (now UP), and Union Pacific.

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