EMD had cold side fan export units years before the T2 was developed for North America. The reason the export units get high radiators with fans underneath is the need to have the radiators higher than the water tank which has to be in a particular relation to the engine top deck and above the water pumps. This is so the radiators will drain to the water tank when the engine is shut down to prevent freezing and to vent the air from the system to the tank. Note the switcher locos since the first SW/SC units had the radiators at the top of the hood for this reason.
To Bryan Jones:
Even though the Clinchfield wound up with under the Family Lines System banner, they only purchased 5 SD40-2’s instead of SD40T-2’s when the Seaboard Coast Line and Louisville & Nashville were stocking up on SD40-2’s, GP38-2’s, C30-7’s and general improvements after the ICC granted them a 20% (or more) rate increase on shipping coal for customers. It seems that CRR wanted a part of the share (as well as Georgia, Atlanta & West Point, but not Western Railway of Alabama) and ended up purchasing SD40-2’s and GP38-2’s (GA and A&WP also purchased GP38-2’s).