robert stephenson and company built a number of crampton type locomotives for the south eastern railway and the london, chatham and dover railway. these were all of 4-2-0 wheel arrangement with inside cylinders and indirect drive. the inside cylinders drove a crankshaft located in front of the firebox and the crankshaft was coupled to the driving wheels by outside rods. they were unsuccessful on the lcdr, and the five "echo" class locomotives were rebuilt as conventional 4-4-0 locomotives after only four years of service.