Ed, The S-2 and the RS-1 are indeed from the same litter, both used the 539 diesel engine and basically the same electrical components. Keep in mind too the RS-1 was first produced before the entry of the United States into WWII and as most Susquehanna fans (and Rock Island, Milwaukee, Atlanta & St. Andrew's Bay and Tennessee Coal & Iron fans too) know, its RS-1's were commandeered my the military, had the AAR Type B two axle trucks replaced with three axle trucks and became Military RSD-1's. RS-2's and later Alco units used the 244 engine until the 251 replaced it in the mid 1950's. Will Shultz Montgomery, Edward T wrote: > Here are a couple of comments on both the May and June calendar shots: > > I've always wondered about this: The May pictures shows an ALCO S2. Is the S2 more related to the engine and electrical components in the RS!/S1 or the RS2? The locomotive looks more like an RS1/S1 design. > Ed Montogmery > > The Erie Lackawanna Mailing List Sponsored by the ELH&TS http://www.elhts.org ------------------------------
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