Last revised: August 1, 2023
By: Adam Burns
The RS11 began a new class of road switcher for Alco. The model was the first offered with a low, short hood and
came equipped with the manufacturer's newest prime mover.
Unfortunately, it could not recapture the market from similar designs soon offered by Electro-Motive. The model was designed to compete directly with the GP9 although EMD's GP18, GP20, and GP30 all entered production when the RS11 was still being cataloged by Alco.
By the time the RS11 debuted EMD was so backlogged with orders for the GP9, along with the fact that railroads had become somewhat distrustful of Alco due to its problematic prime movers, the model had little chance to offer strong competition.
Despite these issues the RS11 proved became Alco's best-selling late model Road Switcher (RS) design. It could be found in service far and wide, from the Great Northern and Missouri Pacific to New Haven and Chicago & North Western. Today, several examples remain preserved.
Alco was seemingly always racing to catch EMD in an attempt to remain competitive with the industry's leading locomotive manufacturer. Ironically, it had pioneered the road switcher design with its initial RS1 in 1941.
However, by the time EMD released the GP9 in 1954 Alco had fallen far behind in the market as the General Motors company was simply offering far superior products that were more rugged, reliable, and efficient. In 1956 the Schenectady builder released the RS11 model, listed by Alco as its DL701.
In many ways, perhaps the RS11 best described Alco's losing battle against EMD, and very soon against General Electric as well. Of course, releasing the model when it did nearly two years after the GP9 went on sale Alco was once again trying to catch up.
Some of its sales for the RS11 was the result of EMD being so backlogged with orders for the GP9 that some railroads went elsewhere to fill their locomotive shortage.
Interestingly, Alco's product in this case was actually a better locomotive than the GP9 in terms of specifications:
Despite these improvements the RS11 really never offered serious competition for EMD, despite Alco's best attempts. The new 251B prime mover did, at least, give railroads more reason to trust the builder's reliability as the engine was not nearly as trouble-prone as the earlier model 244.
For the first time Alco began giving railroads the option to purchase road switchers with either low or high, short hoods (it was always an option before, but only via special request). Still, most continued to purchase them with high hoods although some like the Delaware & Hudson and Southern Pacific did order a few with low hoods.
Beginning with the RSD7, Alco changed the appearance of its road switcher, making it truly a Schenectady product. The builder's RS1s, RS2s, RS3s, and their variants all featured cabs protruding well above both long and short hoods.
However, Alco changed its design so as the hood (particularly the long hood) mounted flush with the top of the cab.
While radiator housings, vents, and other minor various exterior elements could denote an EMD from Alco perhaps what truly set the latter apart was the notched corners housing number boards. This very small, yet classy touch makes for an easy spotting feature of Alco locomotives.
|Entered Production||2/1956 (Demos: To Southern Pacific)|
|Length (Between Coupler Pulling Faces)||56' 11.75"|
|Truck Type||Swing Bolster, Drop-Side Equalizer (AAR Type-B)|
|Truck Wheelbase||9' 4"|
|Traction Motors||GE 752 (4)|
|Gear Ratio||74:18 (65 MPH), 65:18 (75 MPH)|
|Tractive Effort Rating||46,500 Lbs. at 12 MPH|
|Top Speed||75 MPH|
Total Built = 356 (Including Export)
|Owner||Road Number(s)||Serial Number(s)||Date Built|
|Alco (Demonstrator)||701 (became Southern Pacific #5720)||81456||2/1956|
|Alco (Demonstrator)||701A, 701B (became Southern Pacific #5721-5122)||81457, 81458||2/1956|
|Carolina & North Western||11||81464||3/1956|
|Delaware & Hudson||5000-5002||83504-83506||3/1960|
|Delaware & Hudson||5003-5005||83534-83536||3/1960|
|Delaware & Hudson||5006-5011||83685-83690||4/1961 - 5/1961|
|Duluth, Winnipeg & Pacific||3600-3608||81934-81942||8/1956 - 9/1956|
|Duluth, Winnipeg & Pacific||3609-3614||82026-82031||9/1956|
|Erie Mining||300, 301||81914, 81915||6/1956|
|Erie Mining||302, 303||81918, 81919||6/1956|
|Erie Mining||304, 305||81929, 81930||8/1956|
|Erie Mining||306, 307||81932, 81933||8/1956|
|Erie Mining||311, 312||82041, 82042||10/1956|
|Erie Mining||313, 314||82050, 82051||11/1956|
|Green Bay & Western||309||81931||8/1956|
|Missouri Pacific||4601-4612||83492-83503||10/1959 - 11/1959|
|New York Central||8000-8008*||82361-82369||6/1957 - 7/1957|
|Nickel Plate Road||558-562||81459-81463||2/1956 - 3/1956|
|Nickel Plate Road||563-567||82832-82836||3/1958|
|Nickel Plate Road||568-572||82863-82867||3/1958|
|Nickel Plate Road||573-575||83541-83543||5/1960|
|Nickel Plate Road||576, 577||83580, 83581||5/1960|
|Nickel Plate Road||850-863||83014-83027||1/1959 - 2/1959|
|Nickel Plate Road||864||83394||2/1959|
|Norfolk & Western||308-318||81465-81475||3/1956 - 4/1956|
|Norfolk & Western||319-324||81775-81780||4/1956|
|Norfolk & Western||325-333||82057-82065||1/1957|
|Norfolk & Western||334-340||82323-82329||1/1957-2/1957|
|Norfolk & Western||341-343||82340-82342||6/1957|
|Norfolk & Western||344||82358||6/1957|
|Norfolk & Western||345-350||82372-82377||11/1957|
|Norfolk & Western||351-364||82628-82641||11/1957 - 12/1957|
|Norfolk & Western||365-376||82956-82967||11/1958 - 12/1958|
|Norfolk & Western||377-380||83010-83013||1/1959|
|Norfolk & Western||381-392||83395-83406||2/1959 - 3/1959|
|Norfolk & Western||393-400||83435-83442||5/1959 - 6/1959|
|Norfolk & Western||401-406||83691-83696||5/1961 - 6/1961|
|Northern Pacific||900, 901||82830, 82831||1/1958|
|Northern Pacific||902, 903||82881, 82882||6/1958|
|Northern Pacific||904, 905||82948, 82949||7/1958|
|Pennsylvania Railroad||8634, 8635||82338, 82339||5/1957|
|Pennsylvania Railroad||8640, 8641||82646, 82647||11/1957|
|Portland Terminal (Maine)||1082||81917||6/1956|
|Seaboard Air Line||100-106||83588-83594||6/1960|
|Seaboard Air Line||107-109||83681-83683||6/1960|
|Southern Pacific||5845-5856||83407-83418||4/1959 - 5/1959|
|Southern Pacific||5867-5871||83487-83491||8/1959 - 9/1959|
|Toledo, Peoria & Western||400, 401||83008, 83009||11/1958|
|Toledo, Peoria & Western||402||83444||6/1959|
* Alco constructed six additional RS11's for the New York Central, road numbers 8009-8011 (construction numbers 83504-83506) and 8012-8014 (construction numbers 83534-83536), between March 24-31, 1960.
As John Kirkland points out in his book, "The Diesel Builders: Volume Two," after delivery it was determined an Authority For Execution (AFE) was never completed and New York Central rejected the locomotives.
The units were returned to Alco and stored; they were eventually acquired by the Delaware & Hudson between January 31-February 17, 1961 and given road numbers 5000-5005.
|Owner||Road Number(s)||Construction Numbers||Completion Dates|
|Ferrocarril del Pacifico (Mexico)||1501||82371||11/1957|
|Ferrocarriles Nacionales de México (Mexico)||7200-7204||82052-82056||12/1956|
|Ferrocarriles Nacionales de México (Mexico)||7205-7217||82868-82880||4/1958 - 5/1958|
|Ferrocarriles Nacionales de México (Mexico)||7218||83684||4/1961|
|Ferrocarriles Nacionales de México (Mexico)||7219-7253||84414-84448||6/1963 - 12/1963|
|Ferrocarriles Nacionales de México (Mexico)||7254-7293||84449-84488||1/1964 - 4/1964|
|Secretaria de Comunicaciones y Obras Públicas (S.C.O.P.)/Mexico||7123-1 thru 7123-3||82032-82034||10/1956|
|Secretaria de Comunicaciones y Obras Públicas (S.C.O.P.)/Mexico||7123-4||82035||10/1956|
|Southern Peru Copper Mine (Peru)||3, 4||82039, 82040||10/1956|
|Southern Peru Copper Mine (Peru)||5, 6||82359, 82360||6/1957|
|Southern Peru Copper Mine (Peru)||8||83443||6/1959|
In the end, despite the Alco RS11's smaller sales volume it could be found on a number or railroads across the US from the Norfolk & Western and Pennsylvania to the Northern Pacific and Southern Pacific.
Production of the Alco RS11 ended in May of 1964 with a total of 462 units produced in the US and Canada. Several foreign lines picked up examples of the locomotive including the Ferrocaril del Pacifico, National de Mexico, Secretarias Communicaciones de Obras Publicas, and Southern Peru Copper.
Unfortunately, the rest of Alco's road-switcher series cataloged at the time would not see sales reach numbers anywhere near the RS11.