| 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 enaction 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 went into effect on January 1, 2005. (Info taken from Wikipedia) |