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Pennsylvania RR Duplex 4-4-4-4 replica build

Discussion in 'International Heritage Railways/Tramways' started by Martin Perry, Jul 25, 2017.

  1. 240P15

    240P15 Well-Known Member

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    deleted
     
    Last edited: Mar 16, 2018
  2. PC5020

    PC5020 New Member

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    Perhaps it was simply a matter of it not being worth redesigning and making new connecting and side rods. Other large American engines had the same or similar Timken lightweight rods and roller bearings on the rods. N&W J class for example
    had them and 300 psi. You could look up the operating pressure on any of the later engines who used roller rods. And dont forget, engines did not run at full pressure all the time.
     
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  3. 30854

    30854 Resident of Nat Pres

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    I'd imagine such forces impacted heavily on chassis design and therefore weight. Presumably the adoption of cast steel frames, as applied in some later designs, allowed arrangements not readily achievable with the earlier bar frames.
     
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  4. 240P15

    240P15 Well-Known Member

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  5. huochemi

    huochemi Well-Known Member Friend

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    Attached Files:

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  6. Dag Bonnedal

    Dag Bonnedal Member

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    Well, depending on how you look on it, the section around the combustion chamber is a "circular barrel" as well. Albeit with lots of stays.
     
  7. 240P15

    240P15 Well-Known Member

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  8. 240P15

    240P15 Well-Known Member

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  9. 240P15

    240P15 Well-Known Member

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    Have a look at this AMAZING new video promoting this new build project!:)



    Knut:)
     
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  10. Johann Marsbar

    Johann Marsbar Well-Known Member

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  11. 240P15

    240P15 Well-Known Member

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    Thank you som much for posting this Johann!:) Look at the size of the firebox!:eek:
    Seems like a job for guys with good physique this one.

    Knut
     
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  12. Johann Marsbar

    Johann Marsbar Well-Known Member

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  13. Bikermike

    Bikermike Member

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    Good lord! Continental Fabricators are well-named, they could probably knock out a quick Africa if they can do that boiler...

    Also, the tubeplate looks like lace, not a lot of gap between those tubes.

    They look to have built the boiler first. How does the US system re boiler certs work compared to the UK system?
     
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  14. Martin Perry

    Martin Perry Part of the furniture Staff Member Moderator

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    Not much different, but the interval between major inspections is fifteen years.
     
  15. Bikermike

    Bikermike Member

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    What triggers the start of the 15 years? presumably they won't do that bit until they have build a lot more of it. (AIUI UK new builds tend to do the boiler last for that reason - when it's finished it's ten-year interval starts counting down)
     
  16. Jamessquared

    Jamessquared Nat Pres stalwart

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    Or 1472 service days AFAIK. (i.e. 15 years or 1472 days - whichever is less).

    Tom
     
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  17. Dag Bonnedal

    Dag Bonnedal Member

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    If I remember it correctly from a discussion on UP 4014, the counter starts ticking only when the boiler starts to produce steam the first time.
    Thus it could be pressure tested with warm water prior to that.
     
  18. 30854

    30854 Resident of Nat Pres

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    The Corris did No.10's boiler first. AIUI, because the feeling was it's about as firm a statement you're serious as it's possible to make. Isn't the steam test when the clock starts ticking?

    I tripped over a still of the T1 boiler, as shown in Johann's post, [#32]. Ye gods, that thing is absolutely humongous.

    I'm still having to pinch myself to believe progress is coming on this fast. You have to imagine Cheyenne's well publicised return of 4014 (take a well earned bow, UP management and restoration team!) has generated a fair bit of interest in US steam and the iconic T1 is just the right project at just the right time.

    What if they're serious about going for Mallard's record? If there's one design with a realistic chance, it's surely this one. Couple that with all the renewed interest in US high speed rail (What? You hadn't heard the rumblings?), it's a possibility which suddenly doesn't seem quite as far fetched. What a great way that'd be to hand the baton over to modern high speed OHLE in a blaze of publicity that'd be seen right around the world.
     
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  19. Thompson1706

    Thompson1706 Well-Known Member

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    They could ask Jeff Bezos to pay for this loco from his small change, with the completed loco being named 'Amazon '

    Bob.
     
  20. Jon Pegler

    Jon Pegler New Member

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    One of the problems with the original T1s was damage caused to the poppet valves, a problem that was never completely resolved. This was thought to be over-speeding outside the design parameters. That over-speeding was almost certainly caused by speeds in excess of 130mph, although there is no recognised, accurate and authenticated record of such speeds. If the new build is given it's head, Mallard's record may well go across the water.
     

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