I need some information on the 1944 models thank you.
They were, by mass, mostly composed of steel. [:D]
You need to be more specific in your request. Also you should join the Union Pacific Historical Society.
The 1944 model was really big. And really heavy. And most were painted black with Union Pacific on the tender. It was powered by steam.
David B
They also had a lot of wheels!
[There is a bit of sarcasm going on here, if you had not noticed. Even a slightly more specific question would get much better answers. Or Google.]
You really need to spell out what you want so someone can answer you.
The five engines of the second series, built in 1944 were numbered 4020 to 4024 and they orginally carried 28 tons of coal and 25000 gal of water in the tender. Later on they received side boards on the tender which increased the coal capacity to 32 tons. They were all delivered with the Wilson coolers for the Air Pumps, unlike the first series which had the coils mounted on the front deck on both sides of the headlight. All of the Big Boys were delivered with the Turbo Generator mounted on the right side above the front of the rear trailing truck. This proved to be a big mistake because sand, dirt and ashes caused them to fail and the generators were all moved to the standard location up on the left side of the boiler ahead of the fireman.
They all had 68" drivers and were almost duplicates of the first series except for the items I have covered.
In later years, all of the Big Boys had the cab enclosed to the rear as a Union Pacific modification, much like the Challengers and FEF series.
As a matter of fact, one Big Boy, (4005) was converted to oil during the late forties but the burner was sufficient to heat the firebox correctly. One other Big Boy(4019) had smoke lifters fit to it but they were removed within a short time. Pictures of the 4019 really look odd.
Hope this helps.
Cheers
thanks cazephyr.
the information was very helpful. THANKS A LOT