The N class was used to haul services over most of the SECR network and became a familiar sight on the difficult cross-country route between and , on which the steep gradients had taxed the company's 4-4-0 and 0-6-0 designs. The success of the 2-6-0 in traversing this route was due to their higher-capacity tapered boilers that produced an ample supply of steam, and the small 5 ft 6 in (1.68 m) driving wheels that delivered considerable tractive effort when climbing gradients such as the 1 in 100 between and .