A very big American

[sncf231e]

The Union Pacific had a number of 4-12-2 locomotives (one of the largest non-articulated locomotives of all time). MTH made a model of it in 0 that was allowed to run through my garden today:

Regards

Fred

Edited February 22, 2021 by sncf231e

[David Bell]

Lovely loco. 

[Regularity]

1 hour ago, sncf231e said:

the largest non-articulated locomotives of all time

Depends how you define it: the PRR S1 6-4-4-6 is often quoted as the largest rigid-framed steam loco, certainly in service, but before that there was the the Russian 4-14-4, which broke a few records (most coupled wheels, longest coupled wheelbase - 33’!) and even more rails, but made only a demonstration run to Moscow.

 

[BR60103]

details for the modeller

 

 

Those are all the photos I took of it.

 

 

 

Edited September 16, 2024 by BR60103
photos re-installed

[pH]

With Gresley conjugated motion, too!

[sncf231e]

12 hours ago, Regularity said:

Depends how you define it: the PRR S1 6-4-4-6 is often quoted as the largest rigid-framed steam loco, certainly in service, but before that there was the the Russian 4-14-4, which broke a few records (most coupled wheels, longest coupled wheelbase - 33’!) and even more rails, but made only a demonstration run to Moscow.

 

You are right  (and I am wrong ). I have changed it to "one of the largest.

Regards

Fred

 

[sncf231e]

4 hours ago, pH said:

With Gresley conjugated motion, too!

To be seen here:

Regards

Fred

[Regularity]

7 minutes ago, sncf231e said:

You are right  (and I am wrong ). I have changed it to "one of the largest.

Regards

Fred

 

It's the largest loco built as a class, though, and pretty ****ing enormous by anyone's standards.

[Chappers]

There are various HO renditions too, in brass and hybrid. Recent runs include a Broadway Limited version and one by MTH with working 2:1 levers.....in HO. It is also worth noting that there were 88 of the prototypes - most other 12 coupled locos were one offs or very small classes.

[Guest Jack Benson]

Was conjugated valve gear a purely Gresley innovation? I recall that the Prussians began its use at the advent of the 20th century, the most notable (but not the first) example was the G12 2-10-0

 

StaySafe

[sncf231e]

The Gresley conjugated valve gear was a Holcroft/Gresley innovation. Indeed the Prussians also used a conjugated valve gear for 3-cilinder locomotives. The motion for the inside valve was however not taken at the front of the valve rod, as with Gresley, but at the back from the combination lever of the outside valves. As far as I know no name was given to this "invention" in Germany.

Regards

Fred

[sncf231e]

Today the UP 4-12-2 pulled a passenger trains;

Regards

Fred