Without looking at my files I can't say exactly when the extra pipework appeared behind the chimney.Keith&Joanna:68769 wrote:could somebody explain the chimney arrangement please?
However, I do know why it's there!!!
The Dreadnought vacuum ejector that most of the FR locos use had some issues on Mountaineer, I believe the crews were having trouble releasing the brakes after stops, a second ejector was fitted to solve the problems.
The second ejector was so good that it created too much draft up the chimney while the loco was coasting (a real issue on the down hill run) and caused the fire (oil firing) to burn too hot.
Boston Lodge solved this by re routing the second ejector with a single pipe behind the chimney.
For some reason it was then decided to route the original ejector behind the chimney too, and before long a cowl appeared covering the two pipes. This is what Roundhouse have modelled.
I'm not sure I've got this %100 correct, but the essence is two ejector pipes exhaust behind the chimney because of the excessive draft they caused when exhausting up the chimney.
On a personal note, I think this engine is the Bees-Knees...
Roundhouse have managed, in one deft manoeuvre to release my two most favourite locomotives ever....
Thanks guys, I kissed goodbye to nearly £4000 yesterday.