Sd50

Discussion in 'Trainspotter ID' started by Triplex, Aug 8, 2007.

  1. Triplex

    Triplex Active Member

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    After the SD45-2 was abandoned as too fuel-inefficient, EMD developed new high horsepower locomotives. In the late 1970s, they made the GP40X and the second model to use the SD40X designation. These models (not covered here) used 3500 horsepower 16-cylinder 645 engines. In 1980, the SD50S was released. It was an experimental version of the coming SD50. The SD50, also using the 16-645 engine, was produced between 1981 and 1986. (Thus, thanks to the SD40-2F, the last Dash 2 was made after the last example of the first "production" post-Dash 2.) Some SD50s were delivered with 3600 horsepower. Unfortunately, the 50-series gained a reputation for unreliability.

    The SD50 marked a major design change from previous EMDs. The dynamic brake section was no longer above the engine, but behind the cab. Thus, they resemble earlier non-dynamic engines, though there are no non-dynamic SD50s. The radiators are larger than on the 40-series. Except for the SD50S, they are also longer, about as long as an SDP45 or tunnel motor. Despite the distinctiveness compared to earlier models, identifying an SD50 can be hard, as the later SD60 looks very similar.

    Note the hood doors under the radiators. There are only six, as compared to eight on the SD60. This is the only external difference, except that early SD50s have the old style curved blower duct. Only KCS bought early SD50s.

    http://www.krunk.org/~joeshaw/pics/pvt-locos/nrex/nrex5456cr-1-medium.jpg SD50
    RailPictures.Net Photo » Norfolk Southern EMD SD60 SD60

    http://www.northeast.railfan.net/images/emd1983.jpg EMD demonstrator
    RailPictures.Net Photo » Chicago & North Western Railroad EMD SD50 CNW
    LocoPhotos.com - Photo Details - Conrail - CR 6782 CR (Flexicoil trucks)
    http://crcyc.railfan.net/locos/emd/sd50/cr6807cf.jpg CR
    LocoPhotos.com - Photo Details - Conrail - CR 6726 CR Olympic Road Trials (Flexicoil trucks)
    http://crcyc.railfan.net/locos/emd/sd50/cr6707ef-troops.jpg CR "We Support Our Troops" (Flexicoil trucks)
    http://crcyc.railfan.net/locos/emd/sd50/cr6716qef.jpg CR Quality (Flexicoil trucks)
    LocoPhotos.com - Photo Details - Norfolk Southern - NS 5428 CR patched to NS (Flexicoil trucks)
    LocoPhotos.com - Photo Details - Norfolk Southern - NS 5410 CR Quality patched to NS (Flexicoil trucks)
    LocoPhotos.com - Photo Details - CSX Transportation - CSXT 2483 CR Quality patched to CSX (Flexicoil trucks)
    http://www.krunk.org/~joeshaw/pics/pvt-locos/nrex/nrex5456cr-1-medium.jpg NREX ex-Conrail (Flexicoil trucks)
    RailPictures.Net Photo » Baltimore & Ohio (B&O) EMD SD50 B&O Chessie
    RailPictures.Net Photo » Chesapeake & Ohio (C&O) EMD SD50 C&O Chessie
    RailPictures.Net Photo » CSX Transportation (CSXT) EMD SD50 CSX stealth
    RailPictures.Net Photo » CSX Transportation (CSXT) EMD SD50 CSX early
    LocoPhotos.com - Photo Details - CSX Transportation - CSXT 8508 CSX early yellow-nose
    LocoPhotos.com - Photo Details - CSX Transportation - CSXT 8510 CSX bright future
    RailPictures.Net Photo » CSX Transportation (CSXT) EMD SD50 CSX dark future
    LocoPhotos.com - Photo Details - Denver Rio Grande & Western - DRGW 5507 DRGW
    LocoPhotos.com - Photo Details - Union Pacific - UP 5100 DRGW patched to UP
    http://espee.railfan.net/nonindex/sd50_photos/5504sl_sp-sd50-tom_fassett.jpg SP speed lettering, DRGW sublettering
    LocoPhotos.com - Photo Details - Norfolk Southern - NS 6506 NS
    RailPictures.Net Photo » Norfolk Southern EMD SD50 NS (Flexicoil trucks)
    LocoPhotos.com - Photo Details - Kansas City Southern - KCS 710 KCS white (early phase)
    LocoPhotos.com - Photo Details - Kansas City Southern - KCS 708 KCS gray (early phase)
    LocoPhotos.com - Photo Details - Kansas City Southern - KCS 7018 KCS gray
    LocoPhotos.com - Photo Details - Kansas City Southern - KCS 7019 KCS gray Flexicoil trucks (ex-Conrail)
    LocoPhotos.com - Photo Details - Kansas City Southern - KCS 2000 KCS "NAFTA Railway" (early phase)
    LocoPhotos.com - Photo Details - Reading Blue Mountain & Northern - RBMN 5014 RBM&N
    RailPictures.Net Photo » Seaboard System EMD SD50 SBD
    RailPictures.Net Photo » Missouri Pacific EMD SD50 MP yellow
    LocoPhotos.com - Photo Details - Union Pacific - UP 9848 UP
    LocoPhotos.com - Photo Details - Union Pacific - UP 9861 UP lightning stripe
    NREX 5075 - SD50 - M.J. Scanlon - RailroadForums.com Photo Gallery NREX ex-UP
    Appalachian & Ohio 5109 Appalachian & Ohio (WAMX) ex-UP

    The cowl-body SD50F is such a different-looking engine that I'll cover it separately.
  2. Bones

    Bones Member

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    Don't forget the Austrailian built SD50S, several of which are currently in helper (and coal) service on American rails.
    As described here, Utah Ry. SD50S 6061 Measurements, they are 3 feet shorter than the North American SD50S and 10 inches shorter than a SD40-2.

    These locos were built by Clyde Engineering in the early 1980's under license from EMD. The original owner, Hamersley Iron, had a special double layered roof built into the cab with better air conditioners for crew comfort.

    The 5 EMD/Clyde SD50S's running American rails were purchased by Utah Railway in 2001. Because of the small number and unique road name, it's pretty easy to spot them. But.... Incase you happen to see one in the Martin, Utah yard, or SLC yard wearing primer...
    Here are some spotting features:
    Outwardly, it looks exceptionally similar to the early SD50.
    But if you look closely at the rear radiators - UtahRails.net Photo Albums :: Utah Ry. 6061 :: utah_ry_6061_side_view_jul_2003_djs They have a unique 'double step' appearance. The aft-most being taller to get proper cooling in the shortened platform.
    These locomotives also have a smooth, curved blower duct. UtahRails.net Photo Albums :: Utah Ry. 6061 :: utah_ry_6061_air_conditioner_front_jul_2003_djs


    More pictures available here:
    UtahRails.net Photo Albums :: Utah Ry. 6061
  3. Triplex

    Triplex Active Member

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    That's what I forgot! I had remembered the SD50S (both US and Australian versions) but hesitated on whether to put it in this thread or give it its own thread, and then I guess I forgot about it.
  4. jbaakko

    jbaakko Active Member

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  5. jbaakko

    jbaakko Active Member

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  6. Bones

    Bones Member

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    The American SD50S could be a topic of its own. I think the Australian version just qualifies for a mention in the threads, though. There weren't really enough built to justify having a separate topic.

    I have the same feelings for the SD50L... this topic is probably good enough for it.
  7. Triplex

    Triplex Active Member

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    I'd probably put the American and Australian SD50S in the same topic, just because they have the same model designation. People will look for both in the same place.