• ALL THINGS BIG BOY

  • Discussion of steam locomotives from all manufacturers and railroads
Discussion of steam locomotives from all manufacturers and railroads

Moderators: Typewriters, slide rules

  by joeburgard540
 
Thanks Will, nice to know my figures correspond. Just curious as to what source you got that from? Also what is RME?

I drew some Zeuner diagrams for full gear (hand drawn and CAD) based off the info on UP drawing 585 CA 30809, the valve diagram:
Valve Diameter - 12"
Valve Travel - 7"
Steam Lap - 1.375"
Lead - 0.25"
Exhaust Clearance - 0.125"

Results:
Lead Angle - 27.7 degrees
Cutoff - 81.6%
Release - 93.4%
Compression - 4.86%
Admission - 0.15%

As a side note, UP drawing 683 CA 31236 dated 5 August 1944 gives the Power Reverse Gear as the 12" ALCO Type "M". This is for locos 4-8-8-4 #4000-4024 and 4-6-6-4 #3930-3999.

Cheers - Joe
  by Typewriters
 
That's all from my brother's library, specifically the Gregg reprints of specific articles from RME or Railway Mechanical Engineer, which for those unfamiliar was the real biblical trade paper as far as new steam locomotive construction was concerned. I don't know why your drawings list "Type M" and RME states "Special Type H" unless they're one and the same with two different (ie earlier and later) designations.

-Will Davis
  by joeburgard540
 
My bad...I misread your question and to clarify. The two steam plumes on the turret (just ahead of the cab) are the exhuast for the cold water pump and the Nalco Automatic Blowdown. The third plume of steam nearly always seen is from the Pyle National turbo-generator (ahead and on the left or fireman's side of the turret).

Joe
  by John_Perkowski
 
Admin Note:
This thread applies to anything related to a Union Pacific F-E-E-F or 4-8-8-4 articulated locomotive.
  by dan the ca railfan
 
they are restoring a big boy locomotive for the 150th anniversary of the transcontinental railroad. yep for the first time since the 1950s i believe a big boy locomotive will be steaming again.

https://www.atlasobscura.com/articles/w ... locomotive" onclick="window.open(this.href);return false;
  by John_Perkowski
 
As an update, they’ve done the hydrostatic test and the early live steam tests, and they are filling 3985s tender.
  by John_Perkowski
 
As an update...

Yesterday, the Steam Shop in Cheyenne lit off 4014s oil burners.

A Big Boy is under steam again.
  by alzubal
 
The link will not work
  by D Alex
 
alzubal wrote: Fri Apr 24, 2020 6:06 pm The link will not work
It's a year old, and was probably only for the stops planned last year.
  by photobug56
 
This group seems rather dead.