Talk:EMD BL2
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I have read that the BL1 Demo #499 had an air throttle. This was not an accepted railroad practice at the time and the air throttle was replaced with a mechanical throttle making it the equivalent of a BL2 before sale to the C&EI. See Extra 2200 South issue #46 pp 21-24 for BL1/BL2 photos and discussion. --SSW9389 17:47, 2 November 2007 (UTC)
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Thread from Trains.com posted by Fritz Milhaupt detailing the difference between BL1 and BL2. "In John Paton's Chespapeake & Ohio BL2 Diesels (C&OHS, 1991), he explains the difference between the BL1 and the BL2 as being that the BL1 had an air-actuated throttle, while the BL2 was the version built with an electrically-actuated throttle like that used on the F3.
BL1 demonstrator #499 (EMD project #89499) was built and demonstrated with the air-actuated throttle, but all production models had the conventional electrically-activiated throttles which permitted them to be MUed with other locomotives. #499 was converted to an electrically-actuated throttle and equipped with MU hardware before its sale to the C&EI.
The C&O (which had the largest fleet of BL2s of any road) found that MUing BL2s put a good deal of strain on the frames, leading to frame cracking problems. Minor cracks were just patch-welded, but major frame cracking took BL2 #84 out of service for good by 1959." --SSW9389 (talk) 20:08, 18 May 2008 (UTC)