The Raven Class B15 (NER Class S2) 4-6-0s including 825 built with Stumpf Uniflow cylinders

[neildimmer]

What does anyone think regarding the ugliest locos ever built
here’s one
https://railway-photography.smugmug.com ... /i-rgqgrnD
The last B15, No. 825, was built with Stumpf Uniflow cylinders. The Uniflow arrangement was intended to avoid condensation in the cylinders, by having separate intake and exhaust ports on the cylinders. Steam flow was in one direction, hence "Uniflow". The main handicap with this system was than the exhaust ports were always of the same size, but the intake ports could vary in size according to the cut-off position. Comparative trials in 1913 were sufficient that after World War 1, the system was fitted to the last of the Class Z (LNER C7) Atlantics. Further experience showed that the improvement was not as great in normal running, and was negated by the special attention required of these two experimental locomotives. In March 1924, No. 825 was rebuilt with conventional cylinders to match the other members of the class.
conventional B15
https://railway-photography.smugmug.com ... /i-NHh4Fv5

Neil