Hot Water posted:Stuart posted:Hot Water posted:Dominic Mazoch posted:Before the Challengers, the UP did purchased 3 cylinder 4-10-2 and 4-12-2's. I think they wete converted to 2 cylinder.
Only the 2-10-2s were converted to 2- cylinder. ALL the 4-12-2 3 cylinders remained that way right through until the end of steam.
Too rigid and too complex for mountain service?
The 4-12 -2 locomotives worked out the final years, after the Challengers were delivered, in the Nebraska and Kansas plains. A number of the 2-10-2s were used as helpers in the Blue Mountains of Oregon. Remember that the UP didn't have many "sharp curves" in their mountains.
Hot Water, in your reply you wrote "2-10-2s" when I believe you meant "4-10-2s."
No, I did meant 2-10-2s, as the UP 5000 class were 2-10-2s. I can not find any information about UP 4-10-2s, however the SP had quite a number of 3 cylinder 4-10-2s.
The 8800/5090 class 4-10-2's were used on the LA&SL line between Los Angles and Salt Lake City.
Guess I'l have to dig further into the Utah Rails site.
EDIT: OK, found them. There were 10 4-10-2, 3 cylinder locomotives rebuilt in 1942 to 2 cylinder, and apparently ONLY worked on the LA&SL. The UP used many 2-10-2s on their system, especially in the Blue Mountains.
Stuart
Hot Water,
What confused me in you original post was the sentence "Only the 2-10-2s were converted to 2- cylinder." All of the UP 2-10-2's were built as two cylinder engines.
I found two good sources of information on the 4-10-2 types to be the books "Three Barrels of Steam" and "The Union Pacific Types - Volume One."
Stuart
