Somerset and Dorset 2-8-0 and the Tilbury tank engines

Here a little study of the S&D 2-8-0

 

 

I read a little time ago that when the Tilbury and

Southend three cyl tanks were designed the

valve gear was a direct copy on the gear on

the S&D

 

Of course the Tilbury tanks would have had an extra

 set

 

However an interesting question

 

Here some details of the S&D

 

Below the said Tilbury and Southend Railway

tank engine. It too like the S&D was a special

engine fro which Derby was responsible

 

 

So not inconceivable that having a set of gear ready

designed, Derby drawing office simply utilised them

again for a short run of specialist engines.

 

 

Above the preserved Tilbury tank at the National

Railway Museum York

Ex LMS Stanier 4-6-2T tank locomotive 2500 originally built for the London Midland Scottish Company in Derby Works in 1934 and became BR number 42500. 42500 was designed by Stanier for light to moderately heavy passenger and freight trains (mixed traffic).

Technical detail specifications of locomotive 42500/2500: Boiler pressure of 42500/2500: 200 lbf/sq.in., Weight of 42500/2500: 92.5 tons, Wheel diameter of 42500/2500: 3' 3½'', 5' 9", 3' 3½", Valve gear of 42500/2500: Walschaerts piston valves, Cylinders (diameter x stroke) of 42500/2500: 16" x 26" (3), Tractive effort of 42500/2500: 24600 lbf., BR Power classification of 42500/2500: Class 4MT