Curve Radius Question

Inkaneer Oct 17, 2019

  1. HemiAdda2d

    HemiAdda2d Staff Member TrainBoard Supporter

    19,946
    14,673
    243
    Was the Geep trailing in the photo used for dynamic braking? UP Steam does this sometimes, placing a diesel behind the steamer for DB to make the engine work some more, or for downgrades. I don't know if NYC Geeps had DBs, much less see if the one pictures has it.
     
  2. acptulsa

    acptulsa TrainBoard Member

    2,412
    2,011
    52
    Are you sure that isn't an ALCO?

    A locomotive hauled it around, and served as its reverse, as its drive shafts were disconnected to prevent the torque converters overspeeding the Detroit 6-110 diesels.

    As Jake noted, those prime movers on the roof had no reverse.

    Yes, the diesels overheated, and the high temp automatic shutdown had to be disconnected. At least one of them had to run anyway, as the jet shafts weren't even geared to the air pump, much less any generators. And yes, brakes were considered important.

    How did this conversation get started in a thread about curves? This thing was modified solely for the straightest stretch of track the NYC owned.
     
    Last edited: Sep 23, 2021
  3. BigJake

    BigJake TrainBoard Member

    923
    853
    21
    Thanks for correcting my misinformed opinion.

    However, I was partially correct in that there was no reverse thrust capability. It sounds to me like the goal of the experiment was re-stated to declare success. Note also that the testing was only on straight track with no curves (for very good reason), rendering it completely irrelevant for practical use (as is evident to this day). The effort was really not much more elaborate than a simple sled test.

    I thought that engine pod looked familiar! The B-36 was built at AF Plant #4 in Fort Worth, where I worked for 15 years (long after that.) I have a poster of the plane, signed in my presence by the test pilot, during an anniversary celebration of its first flight. The film "Strategic Air Command" (starring Jimmy Stewart and June Allison) features the plane, and footage of Carswell AFB and next-door AF Plant #4.

    The B-36, eventually equipped with four of these jet engines (in two pods), and six massive 28-cylinder radial piston engines spinning 3-blade pusher props, was the largest and most powerful bomber in the fleet. The original version, before the jets were added, is the worlds largest piston-engine airplane to ever fly. It's payload even exceeded that of the venerable B-52 that still flies today. The B-52 is exclusively powered by similar jet engines in pods of two each.
     
    acptulsa likes this.
  4. BigJake

    BigJake TrainBoard Member

    923
    853
    21
    The diesel locomotive shown was only used to pull the jet-powered RDC back, since the jet-equipped RDC had no reverse capability. I don't believe it was attached during the jet-powered test run.

    Diesels are also included on UP Big Boy steam excursions to generate electricity for the passenger and support cars.
     
  5. acptulsa

    acptulsa TrainBoard Member

    2,412
    2,011
    52
     
    Doug Gosha, NtheBasement and BigJake like this.
  6. NtheBasement

    NtheBasement TrainBoard Member

    293
    256
    16
    MOW could use it as a ballast cleaner.
     
    BigJake and Shortround like this.

Share This Page