The nickname for units like these is "DeWitt Geep," but that, in itself, is a misnomer. Many of the rebuilds were done at Juniata Shops in Altoona, and most of the donor EMD prime movers came from retired E-units, not Geeps... The program started with Penn Central... they were looking for a way to extend the life of their fleet of Also RS's, and did a few test units at DeWitt Shop in Syracuse. The program continued with Conrail, through to about 1979 or so. By then, new power was arriving, and Conrail decided the program was not cost effective to continue. Oddly enough, it seems that most of the units I have encountered are ex-DL&W/EL units.
Housatonic 9935 is former Conrail 9935 (rebuilt 1979, sold to HRRC in 1986), ex-EL 1048, exx-DL&W 910 (built April 1951).
It don't sound like an Alco, but that classy engine put on a good show.
-otto-
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