Steam & Excursion > UP SAC 3501, The Dalles

UP SAC 2-8-8-0 no. 3501 at The Dalles, May 5, 1945. Don Roberts photo, Dave England collection.

UP SAC 2-8-8-0 no. 3503, out of service at Pocatello in 1947. Don Roberts photo, Dave England collection. UP 3503 was retired in March 1948. Note the smoke hoods, although I don't know how they worked or how and where they were used.

Don Strack

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What is the "UP SAC" designation?

I believe the smoke hoods were used for going through the Peninsula Tunnel out of Albina Yards.

HotWater Wrote:
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> What is the "UP SAC" designation?


Simple Articulated Consolidation, something made up in house when they simpled the Mallet Compounds.

GM

Ah Ha! Cylinder Head cover used as stack cap, as per thread below?



Edited 1 time(s). Last edit at 12/19/14 15:41 by Kimball.

HotWater Wrote:
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> What is the "UP SAC" designation?


Strategic Air Command?

Don ,

These smokehoods were segmented side folding hoods rising up on each side, and as stated for departures east from Portland.

GM

HotWater Wrote:
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> What is the "UP SAC" designation?

Simple Articulated Consolidation.

All 70 locomotives were built in 1918-1924 as Mallet Compound (Class MC), numbered as UP 3600-3664, OSL 3703-3705 and OWRR&N 3803-3805. They were simpled in 1937-1938 and 1942-1944, and renumbered to UP 3500-3569.

Gordon McCulloh covers these locomotives very well in his book "A History of Union Pacific Steam" in Chapter 12 (Class MC) and Chapter 17 (Class SAC). He does a great job explaining these two important classes of UP steam locomotives.

I have compiled some roster data at these two web pages:

http://utahrails.net/up-steam-roster/up05-1915-1962-13.php

http://utahrails.net/up-steam-roster/up05-1915-1962-14.php

Don Strack

I believe these 2-8-8-0's were also called a "bull moose"?...

donstrack Wrote:
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> HotWater Wrote:
> --------------------------------------------------
> -----
> > What is the "UP SAC" designation?
>
> Simple Articulated Consolidation.

> Don Strack

Well I'll be damned! Thanks, Don.

Work just like the hoods on the 3900s and 4000s. Operated by an
air valve in the cab.

What's the funny looking, smaller steam cylinder on top of the 2 main driver cylinders in the front??

coach Wrote:
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> What's the funny looking, smaller steam cylinder
> on top of the 2 main driver cylinders in the
> front??

That swivels and is where the steam line to the front
valves and cylinders connects to the top of the cylinder
casting.

Can anyone tell what the bell crank and rod running from just above and ahead of the second cylinder
and running towards the eccentric link is?
Thanks for sharing Don!

NathanNon-Lifting Wrote:
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> Can anyone tell what the bell crank and rod
> running from just above and ahead of the second
> cylinder
> and running towards the eccentric link is?
> Thanks for sharing Don!

It is the 'Power Reverse 'rod. As can be seen the power reverse faces rearwards and you can see the linkage extending downwards and connecting to this rod, admittedly it's not that clear in this photo.

Malcolm
New Zealand.

coach Wrote:
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> What's the funny looking, smaller steam cylinder
> on top of the 2 main driver cylinders in the
> front??

NathanNon-Lifting Wrote:
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> Can anyone tell what the bell crank and rod
> running from just above and ahead of the second
> cylinder
> and running towards the eccentric link is?

Here are a couple close-in crops of the photo.

Don Strack

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