E44's were designed to replace the P5, P5a, P5b, delivered around 1963. They were 4400 hp, and later upgraded to 5000 by conversion of the rectifier. They were ordered by PRR, also operated by PC and CR, as well as a few for MoW at Amtrak - the last preserved E44 was in Amtrak MoW silver for a while, but is now in PRR colors.
E33's were ordered by Virginian to augment their fleet in VA, but were retired at the NW takeover because the line was one-wayed to increase capacity. They were sold to NH, which was low on money, and needed new motive power - not much market for electrics = cheap used electrics. They developed 3300hp, and were absorbed by PC and later CR. Funny thing is, after PC absorbtion, I've rarely seen pics of E33's in Connecticut - more in PA or NJ.
Other observations:
- you will see HO and O models of E33's, but never E44's
-E33's have diamond-shape pans, E44's have faively pans
-You will see E33 models for other RR's including NYC, etc... - don't believe this, they went VGN>NH>PC>CR
-there's a really neat pic of a EP5 jet doing PC local freight on railpics.com - 1976, last operating, state of PA (and disrepair) - this was an ignitron rectifier loco as well
-The E50 was sold only to AEP for a coal mine in ohio, that was shut down a few years ago - anybody know where these E50's are?
- Railfan and Railroad had an article on the E44 about 1994 - great one.
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