NBR S class
The NBR S Class (LNER Class J37) was a class of 0-6-0 steam locomotive designed by William Paton Reid for freight work on the North British Railway. The engines were initially designated as B class, being a development of the standard B class locomotives designed by Reid some eight years previously, and represented the culmination of a long evolution on the NBR of powerful 0-6-0 freight engines. The new locomotives were introduced in 1914 and had superheaters, inside cylinders and piston valves operated by Stephenson valve gear. Design evolution The North British had built large numbers of 0-6-0 freight engines of earlier classes, and during the incumbency of Matthew Holmes these reached his highly numerous C class design, consisting of 200 locomotives in total (168 of his own engines, later designated LNER class J36, plus 32 rebuilt from the highly similar 1876 design by Dugald Drummond, later designated LNER class J32). Reid set out to develop this design, and improve upon it, producing the standard NBR B class (later LNER class J35), of which 76 examples were built. They were larger and heavier than the earlier engines, and in common with Reid's common practice, had a high boiler pitch. In