Union Pacific Big Boy on Turns

Discussion in 'HO Scale Model Trains' started by UPJunkie, Nov 22, 2004.

  1. UPJunkie

    UPJunkie Member

    What radius of turns will the Union Pacific Big Boy would work on? I have 4 ft to work with on the turns. :confused:
  2. David Rosser

    David Rosser Member

    Several years ago I had the use of a borrowed Rivarossi Big Boy on our layout which is not very big and has two places with a curve radius that is only 20 inches for a short distance. I had no problem at all with operation, but you do need to be aware that you can not have a signal stand or a bridge pier, or any structure, too close to the track, because that front end will swing like crazy. Good luck. Dave
  3. UPJunkie

    UPJunkie Member

    thanks for replying back to my post this will help me alot

    :thumb: :thumb: :thumb: :thumb:
  4. eightyeightfan1

    eightyeightfan1 Now I'm AMP'd

    I have the Rivorossi Big Boy. I'm using 24" radius.
    I think its suggested radius.
  5. shaygetz

    shaygetz Active Member

    Those beasties are designed for 18" radius ( the older ones anyway) but, just like Dave said, your LPBs, telephone poles, signals and signs...buildings....mountains...basically anything within 2 1/2" of the main is toast :eek:. In 4 feet you have enough room for 22" curves, that'll give it some breathing room. My Cab-forward still has some surprizing overhang on the club's 30" radius.
  6. Dragon

    Dragon Member

    I have a recent Big Boy. Yes it can handle 18" radius, and yes, you DEFINITELY want to keep lineside deatils low, or far away from the rails. The smokebox hangs almost a half-inch outside the turns (maybe more, I can measure it when I get home).

    If you like, I can take a couple pics of my Big Boy on 18" radius track.

  7. UPJunkie

    UPJunkie Member

    that would be kewl of you bro and that will help me out alot
    if you can, Can you take a over head shot

    :thumb: :thumb: :thumb:
  8. Dragon

    Dragon Member

    Sure thing. I'm always looking for a reason to put that beast on a track. :)
  9. kchronister

    kchronister Member

    I tussle with this all the time. I don't have an articulated loco myself, but friends have brought theirs over and they run fine on my 22" curves. HOWEVER, they look pretty funny doing so... It becomes a question of how far you're willing to stretch your reality. NOTHING on my layout would like meet the "is it truly prototypical" test, but I do find a difference between not-prototypical and OBVIOUSLY not-prototypical operations...
  10. Dragon

    Dragon Member

    ok. As promised, here ya go. (pics are 1024x698)



    (Yes, Kyna is really trying to bite the tender, and no...she did not scratch it.)

  11. siderod

    siderod Member

    What a cute cat!
  12. kchronister

    kchronister Member

    I just had the pleasure of seeing the real deal in the flesh yesterday... And much as my heart lusts for a miniature of it for myself, I just can't bring myself to run it over the curves with such overhangs... Or to consign it to a shelf for viewing only. Oh well, Pennsy didn't run 'em anyhow so it's a double-unprototypical.

    But on a technical level, pretty amazing that they could make it go 'round such turns, huh?
  13. shaygetz

    shaygetz Active Member

    I use two cures for that; 1). I run my railroad as a scenic one with trackage rights over the B&O. Takes care of why I'd have unusual and well kept steam. 2). I have on file a real life picture of a 72' passenger coach being taken around the real life equivilent of 18" radius curves, apparently some backshop street trackage in the city. I'll see if I can dig it up and post it.

    There's a prototype for just about anything and plausibility gets stretched in real life all the time. Somewhere I even have a pic of a woodburner being pressed into passenger service in 1949, pulling streamlined cars, all because of the Holiday rush and a shortage of motive power.
  14. Dragon

    Dragon Member

    Yeah, even the boiler on my Mantua 2-6-6-2 swings a little wide on 18" radius. But that won't stop me from using it!

    In fact, my step-father-in-law has a video of a prototype steam engine running over the turn-outs at Steamtown. I can't remember for sure, but they had to run super slow or risk splitting the frog.

    It was funny seeing this massive steamer crawling so slowly, with men walking beside it to make sure it stays on the rails.

    Kinda makes you wish for a giant-sized 0-5-0 in case of trouble? :)


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