(There are discrepancies in these engine numbers, making it difficult to identify engines in this instance). Cylinder diameter 1ft 2in, stroke 1ft 8in for the Northern and Eastern Railway; driving wheels 6ft diameter; the sandwich iron plate wooden frames are placed inside the driving wheels which have no outside bearings; there are no central or other frames; driving springs are underhung. This drawing marks an interesting transition between Robert Stephenson's patent design of 1833 and 1841. Drawing reference - 87.