High Quality Content by WIKIPEDIA articles! The SECR N1 class was a type of 3-cylinder 2-6-0 (`mogul`) steam locomotive designed by Richard Maunsell for mixed traffic duties, initially on the South Eastern and Chatham Railway (SECR), and later operated for the Southern Railway (SR). The N1 was a development of the basic principles established by the Great Western Railway`s (GWR) Chief Mechanical Engineer (CME) George Jackson Churchward and by Maunsell`s previous N class design.