Ex LMS 2P 4-4-0 and Compound 4-4-0

[LMS2968]

Yeah, we got a bit carried away!

[Aire Head]

26 minutes ago, Roger Sunderland said:

Wow. Pardon me for starting this discussion. I only wanted to know if there was a difference in length of the boilers! 

 

Oh no need to be pardoned. These are sometimes the best threads on RMWeb!

[62613]

9 hours ago, Compound2632 said:

 

And the author is on RMWeb from time to time.

When I was at sea in BP, there was an engineer with the same name; I wonder if it's the same fellow?

[Compound2632]

1 minute ago, 62613 said:

When I was at sea in BP, there was an engineer with the same name; I wonder if it's the same fellow?

 

Very likely; he is or was a marine engineer by profession.

[kevinlms]

19 hours ago, Roger Sunderland said:

Wow. Pardon me for starting this discussion. I only wanted to know if there was a difference in length of the boilers! 

But no such question are ever easy. There can be all sorts of reasons and boiler design as discussed throughout this thread (and many others), was never as easy as just making a boiler bigger and so it would be better at making steam - which obviously was the whole point.

No, if you got the proportions wrong, if wouldn't steam right and boilers were often modified several times. As suggested above look for a history of Jubilee boilers and also the Princess class. Both were LMS examples and there was quite a complex history of refining the boilers. Adding/reducing the number of tubes and their diameter, increasing the number of superheater tubes, etc.

History is littered with tales of how locomotives, didn't perform as their designer intended/hoped for!