The Alco RS2

The Alco RS2 was the builder's second entry in its Road Switcher series. Buoyed by the success of its earlier RS1 model, the American Locomotive Company (Alco) released a more powerful version following the end of World War II.   Externally, the RS2 nearly resembles the RS3, cataloged a few years later. However, it was somewhat less powerful and Alco also tweaked the design just slightly.  At the time of the RS2's production, Alco was essentially the early leader in road-switchers as railroads were quite pleased with the new lightweight, yet powerful design. The locomotive sold slightly better than its early counterpart, the RS1, and the new styling and increased horsepower paved the way for the phenomenally successful RS3. Today, the model is one of the least preserved early RS series models as only a handful are preserved.

The Alco RS2 is sometimes a forgotten model in the builder's early road-switcher series.  Interestingly, there are few differences between the RS2 and RS3 although the former was the first to employ Alco's very own model 244 prime mover.  Before this time the builder had employed engines supplied from McIntosh & Seymour (the model 539T), which proved to be fairly reliable in the early RS1, S1, S2, and original HH models (early switchers of the 1930s).  While the model 244 did prove its worth in the RS2 and later RS3 for secondary and light branch line duties it suffered from the same issues as the 539T in standard road service. Alco had tried the M&S prime mover in its original DL series for main line applications although mechanical issues resulted in few being sold.

For more information about the RS2 please click here.  The 244 experienced problems in Alco's model FA and PA, released in 1946 with the RS2.  These two cab designs, one meant for freight service (FA) and the other designed to haul passenger trains (PA), replaced the DL models.  They were clad in an attractive carbody and offered excellent tractive effort but suffered mechanical issues, primarily due to the fact that the manufacturer had not spent enough research and development on the prime mover.   It was said that after World War II had ended and manufacturers were once again free of wartime restrictions Alco management wanted the 244 engine ready for production by no later than early 1946. Interestingly, despite the model's problems in heavy-haul service it proved to be quite successful in the switcher and small road switcher deigns.

The Alco RS2 debuted at 1,500 horsepower, which would increase to 1,600 before production ended in March of 1950. The first railroads to receive theirs included the Delaware & Hudson Railway and Detroit & Mackinac between November and December of 1946 (both lines remained loyal Alco customers practically until Alco left the locomotive market during the late 1960s).  Perhaps the most noticeable difference between the RS1 and RS2, outwardly, was the latter's updated, beveled carbody design also used on its successor, the RS3. With added streamlining some railroads found the RS2 more practical in passenger service than the RS1 (despite the fact that both could be equipped for such).

Mechanically, the RS2 used air brakes and compressors from Westinghouse while the model 752 traction motors were produced by General Electric. The B-B truck setup (two powered axles per truck) could produce 42,500 pounds of tractive effort (nearly 10,000 pounds more than the RS1) and the RS2 came equipped with dynamic brakes.  At 55 feet, 5 inches in length it was about the same size as the earlier RS1 while the later RS3 was just slightly longer. With the RS2s finely designed carbody, horsepower, and other attributes it came to be used in applications far outside of what Alco had intended as railroads found the model quite utilitarian in either passenger service or as auxiliary power in heavy drag service.

Production Roster Of Alco RS2s


Owner Road Number(s) Quantity Date Built
Alco Demonstrators1500 (1st/2nd), 150131947-1948
Alton & Southern28-42151947-1948
Altantic & Danville101-10661949
Belt Railway Of Chicago450-45891949
Birmingham Southern15011949
Boston & Maine1501-1504, 1530-153491949
Carolina & North-Western1-441948
Chesapeake & Ohio5500-550121949
Chicago & North Western150311948
Chicago Great Western50-5781949
Danville & Western1-221949
Delaware & Hudson4000-4025261946-1949
Detroit & Mackinac466-469, 481, 461061946-1948
Elgin, Joliet & Eastern800-809101948-1949
Erie900-913, 950-954191949
Frisco550-55451949
Great Northern200-219201947-1950
Green Bay & Western301-30441950
Gulf, Mobile & Ohio1501-1514141948-1949
Kennecott Copper100-107, 902-903101948-1949
Lake Superior & Ishpeming1501-150331949
Lehigh & New England651-663131949
Lehigh Valley210-21451949-1950
Macon, Dublin & Savannah1700-170231949
Maine Central551-55551949
Missouri-Illinois Railway6111949
Monon21-2771947-1948
Napierville Junction Railway4050-405121950
New Haven500-516171947-1948
New York Central8200-8222231948-1950
Oliver Iron Mining1100-100781947-1948
Rock Island450-45451948
St. Louis & Belleville Electric Railway70011949
Seaboard Air Line1600-1628291949-1950
Southern2101-2130301949
Spokane, Portland & Seattle60-6231949-1950
Texas Pacific-Missouri Pacific Terminal21-2331948-1949
Toledo, Peoria & Western200-20671948-1949
Union Pacific1191-119551948-1949
Union Railroad601-612121948-1949
Western Maryland180-18451947-1950
Youngstown & Northern23111948


From a sales standpoint the RS2 was modestly successful outshopping more than 400 units (as noted in the chart above, which lists every buyer of the locomotive). Perhaps more importantly, though, dozens of large and small railroads all over the country purchased the RS2 as well as a few private industries.  The locomotive's success set the stage for the RS3, cataloged a few years later. It should be noted that Alco's Canadian arm, the Montreal Locomotive Works, also produced eight models total between the Canadian Pacific, Ontario Northland, and Roberval & Saguenay.   To read more about other Alco Road-Switcher (RS) models please visit the Diesel Locomotives section of the site, which can be reached from the top of this page.

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