The SECR N1 class was a type of 3-cylinder 2-6-0 steam locomotive designed by Richard Maunsell for mixed traffic duties, initially on the South Eastern and Chatham Railway, and later operated for the
The N1 class prototype, No. 822 seen here at the SECR's Ashford works in 1922. Smoke deflectors were added during the early 1930s. Note the linkage for Holcroft's inside valve gear, connecting the right-hand combination lever assembly and the inside cylinder