[2] The cylinder and piston valve design and the setting of the Walschaerts valve gear, allowing a maximum travel of 6+3⁄8 inches (16 cm) in full gear, was believed by O. S. Nock to subsequently lead to the "outstanding success" of the class.

[2] Most of the class were used on longer-distance commuter trains from stations in London, Manchester and other large towns.

[citation needed] A number were allocated to Tebay Motive Power Depot and were used to bank heavy passenger and goods trains up the steep incline to Shap on the LMS West Coast Main Line.

[citation needed] Despite having relatively small 5 feet 9 inches (1.75 m) driving wheels, the class was noted to reach speeds over 80 miles per hour (130 km/h) on outer suburban services to and from Euston.

[1] No locos were preserved, but the January 2013 edition of The Railway Magazine reported that a new-build project to recreate a Fowler 2-6-4T was at an initial research stage.