Building of a “Princess Royal” Class Steam Locomotive at the Crewe Locomotive Works
Fascinating
[youtube]http://youtu.be/hRsYIiUxZeQ[/YouTube]
This is very interesting, especially the casting process. How did they get the sand to stick together? The locomotive seems to have 4 cylinders, two inside the frame and two outside the frame. Another example of the designers being sure that they would never have to maintain the thing.
Very interesting, Thanks
Very good! 
Steve, when we did sand casting in school, the sand was mixed win some kind of oil. That way it would stick together, and pack real nice and firm for casting.
Its a four cylinder compound locomotive two high pressure and two low pressure ones just like a Mallet only with one set of drivers. Compound engines were much more popular in pre-war Europe, they never caught on in America.
Very cool video!! Very different process than you would see now days that’s for sure!! Thanks for posting this Steve!! So who here is going to model this first 
As preserved and running…here in UK.
Aster have had a model of this kind of locomotive in Gauge 1 for around seven years or so.
Aster actually have made Gauge 1 compound models, French, of course…the new 241P is a compound that really works as such.
BTW, The Princess Royal Class of locomotive was not a compound - all four cylinders were of the same dimensions. The LMS had only one type of compound - a 4-4-0, aptly named the Midland compound. Compunding was not a success in UK that it was in France, Switzerland, The Netherlands, Sweden, Germany and Austria and the cost was not thought to be worth it in view of the excellence performance of British locomotive designs that operated satisfactorily without that added complication.
tac
Ottawa Valley GRS