GP35 - Units SLSF 700-716 Equipped With Roof Top Mounted Air Reservoir Tanks And Associated Piping

Discussion in 'GP35' started by dricketts, Feb 17, 2013.

  1. dricketts

    dricketts Member Supporter

    Has anyone seen evidence of the black and yellow GP35's without the torpedo tubes?
  2. pbender

    pbender Member Supporter

    The second ( and later ) order of GP35s arrived on the property in orange and white paint.

    Of the GP35s, Only the ones with torpedo tube were ever painted black and yellow.

  3. klrwhizkid

    klrwhizkid Administrator Staff Member Administrator Supporter

    Derrick, for further clarification, the torpedo tube GP35s were 700 - 716.
  4. 19th st.

    19th st. Member

    Does anyone know where I could find a roof top picture of a torpedo unit that shows the rear of the air tanks with the piping.

    I have the Diesel Era magazine, May/June 2000, with the Frisco GP35 drawings for these units, but as of yet I have not found a photograph on the internet.

    And also, I have found a photograph of GP35 SLSF 709 dated 1976 in its original livery.

    Would this be the last unit painted so, and what date was it finally re-painted?

    I ask because I will use this as my modelling date.

    Thanks for any help on these questions.

    Last edited by a moderator: Mar 2, 2024
  5. Oldguy

    Oldguy Member Supporter

    Last edited by a moderator: Apr 8, 2016
  6. 19th st.

    19th st. Member

    Talk about not seeing what is under your nose!


    Last edited by a moderator: Mar 2, 2024
  7. meteor910

    meteor910 2009 Engineer of the Year Staff Member Supporter


    Welcome to the group.

    Attached FYI is a sketch I drew back in 1982 of GP35 SLSF 702, or maybe it was SLSF 706, in Mandarin orange and white livery, as it sat idling close to the depot in Rolla, Missouri on the Rolla Subdivision.

    A few details differ from the general drawing you referred to from Diesel Era, but I believe this is representative of what the arrangement was on the Frisco "torpedo boats".

    SLSF GP35 roof tanks & piping.jpg

    I have ridden the rails a number of times in the UK and enjoyed it. I have a very good friend in London, whose son was an avid British rail fan.

    He passed away at a too young age, and my friend gave me one of his favorite books, British Railways Locomotives & Other Motive Power, published by Ian Allen.

    His son had noted every locomotive he had seen in person alongside its number in the roster tables in the book.

    He saw quite a few!

    Last edited by a moderator: Mar 2, 2024
  8. 19th st.

    19th st. Member

    Thanks Ken for re-posting your drawing here.

    Nothing beats first hand experience.

    I also followed the link "oldguy", sorry do not know your name, posted. I had an enjoyable hour reading through the posts and drooling over the pictures.

    Some really beautiful work by Tom Holley.

    And even though I am building a small HO layout at the moment, my main passion is O scale/proto 48.

    That is what these questions were aimed at, as I am going to build a black and yellow torpedo GP35 out of an Atlas O-scale locomotive.

    I used have a similar book too when I held an interest in British rail.

    Then about 25 years ago I found a copy of Model Railroader at a local preserved railway, and as they say the rest is history!

    And of course, it is always a shame when someone passes away at a young age.

    So much lost potential.

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  9. Oldguy

    Oldguy Member Supporter

    My name is at the bottom of my posts. :)
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  10. 19th st.

    19th st. Member

    Cheers Bob,

    I really must get my eyes tested!! :eek:

    Last edited by a moderator: Mar 2, 2024
  11. wpmoreland719

    wpmoreland719 Member Supporter

    Just a question about these "torpedo tube" roof mounted reservoirs.

    Where were the valves for draining condensation located?

    I think these engines would pre-date "spitter" valves, but I could be wrong about that.

    Hopefully someone did not have to climb onto the roof to open them.

    Going through a cold spell and having some air brake issues just made me think about this.

    Pat Moreland,
    Union, MO
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  12. Did any of the GP35s arrive with both torpedo tubes and Alco truck.

    Even though it does not fit my era I think a black and yellow GP35 would be neat to have in model form.


    Murphy Jenkins
    Last edited by a moderator: Mar 2, 2024
  13. tmfrisco

    tmfrisco Member Supporter

    Murphy, to answer your question in one word: no.

    As Keith stated the "torpedo tubed" GP35s were in the original order delivered from March 26, 1964 to April 25, 1964. According to Marre these units were also the last black and yellow units on the Frisco. The Alco-designed trucks equipped GP35s were in the third and last order and received these trucks salvaged from FA/FB trade-ins.

    Only the last GP35 (732) in this group received the traditional Blomberg trucks. There seems to be a disagreement in the text in Marre's book on page 126 in his discussion of unit SLSF 720 where he says the second and third orders received the 3000 gallon fuel tank and regular placement of the main reservoirs.

    He states on page 127 in the discussion of unit 728 that the Alco equipped units had a slightly reduced fuel capacity tank. Maybe it was of such an insignificant amount that the difference was not worth considering. One thing I found interesting is that the gear ratio on the Alco equipped units was 74:18 rather than the customary EMD ratio of 62:15.

    Pat, you are correct that these units did not have the "spitter" valves. We must have had a convenient location to drain the condensation, but I can not remember where it was. I will say that when those "spitter" valves did show up, it was irritating.

    It also seemed to me that all of those pressure and moisture relief valves seemed to know when I was walking beside them because they inevitably would exhaust with me right beside them. It is no wonder that I have ringing in my ears and hearing loss.

    When the hearing protection programs were implemented, it did help, but the damage was done.


    Edit 3/2/2024: The trucks under these units are NOT Alco designed trucks.

    They are American Association of Railroads (AAR) Type B trucks.

    These two axle trucks are often misidentified as "Alco trucks". The same trucks were used under the majority of General Electric's (GE) UxxB and Bxx-7 series B-B units. In fact, most of Alco's early production models used electrical components and truck traction motors supplied by General Electric.

    In addition to Alco and GE, other locomotive manufacturers also used this style truck including Baldwin and some Fairbanks-Morris (FM) units. Most locomotive manufacturers had the trucks cast for them by General Steel Castings (GSC).

    The AAR Type B trucks had a standard gear ratio of 74:18. This gear ratio was slightly different than the comparable General Motors (GM) Electro-Motive Division (EMD) design Blomberg B two axle truck. The Blomberg B, and its subsequent M and X variations, standard gear ratio was 62:15.

    The AAR Type B truck is distinguished by its double drop equalized side frames. The Blomberg B truck is distinguished by its outside swing hanger and leaf coil springs design. The later M model featured a snubber shock absorber type dampening strut on diagonal journals.

    Added additional information concerning AAR Type B trucks.
    Last edited by a moderator: Mar 3, 2024
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  14. wpmoreland719

    wpmoreland719 Member Supporter

    Thanks, Terry.

    We only have one GP38 equipped with spitter valves, and I agree, it always seems to "spit" when I am right next to it. I wear hearing protection, but it is still loud, and always seems to catch me off guard.

    I really like the look of the torpedo GP35s, but it seems like they would have been more difficult to maintain, especially with some of the train line piping running along the roof as well.

    Pat Moreland,
    Union, MO
    Last edited by a moderator: Mar 2, 2024
    RogerRT likes this.
  15. Terry,

    Thanks for the information.

    I knew they were delivered in separate orders, but I did not know if the Frisco ever swapped trucks around on the units after they got them for repairs or perhaps if one was wrecked.


    Murphy Jenkins
    Last edited by a moderator: Mar 2, 2024
  16. Blackhat Jake

    Blackhat Jake Member

    I had the occasion to shoot the butt-ends of two Frisco GP35s after they received their BN dress.

    SLSF 701 was BN 2551, while SLS 725 was BN 2575. 2 GP35 SLSF 701 / 2551 clearly has rooftop-mounted air tanks. Notice below the frame there is a hose aimed in the general direction of the elliptic springs of the truck, and that a portion of those springs appear "damp" in this Tri-X photograph.

    While this is not the aforementioned valve per se, could this be the outlet for the blowdown valves?

    Edit 3/2/2024: No. The hose near the truck leaf springs is the engine room sump drain pipe. It is not a drain for moisture or the blowdown valves for the roof mounted air cylinder reservoirs.

    Last edited by a moderator: Mar 3, 2024
  17. TAG1014 (Tom Galbraith RIP 7/15/2020)

    TAG1014 (Tom Galbraith RIP 7/15/2020) Passed Away July 15, 2020 Supporter

    I feel like the black and yellow GP35s were the last "real" Frisco engines!

    By the way, they really had LOUD air horns!

    When you were waiting at a grade crossing, you had to roll up the windows if a GP35 was in the lead.

    Tom G.
    Last edited by a moderator: Mar 2, 2024
  18. wpmoreland719

    wpmoreland719 Member Supporter

    I am not a 100% on this one, but the pipe angling down toward the truck springs looks like it may be part of the engine oil drain, or possibly the coolant drain.

    Pat Moreland,
    Union, MO

    Edit 3/2/2024: The hose near the truck leaf springs is the engine room sump drain pipe. It is not a drain for moisture or the blowdown valves for the roof mounted air cylinder reservoirs. Nor is it a engine oil drain or engine coolant drain unless those fluids ended up in the engine room sump.
    Last edited by a moderator: Mar 3, 2024
  19. klrwhizkid

    klrwhizkid Administrator Staff Member Administrator Supporter

    Here is a roof-top picture of GP35 SLSF 707.

    Edit 3/2/2024: Photograph taken east of the Springfield Diesel Shop from the east side of the Missouri Highway 13 / Kansas Avenue viaduct. Note the company sand service hopper car parked adjacent to the service tracks shed. View looking east.

    Added photograph narrative.

    BN_SLSF_GP35_2557_Springfield lightened.JPG
    Last edited by a moderator: Mar 2, 2024
  20. Ayerox

    Ayerox Member Supporter

    Nice shot Keith, thanks for sharing!

    Last edited by a moderator: Mar 2, 2024

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