His new and robust designs allowed the timetables to be accelerated, and it soon became clear that passenger locomotives with greater power were needed.

This was because such a design had been proven on other railways such as the Great Central, and the additional traction provided by an extra pair of driving wheels was useful in starting heavy trains.

[1][page needed] The resultant class T14 incorporated many features seen previously on his other 4-6-0 designs, the Drummond lipped chimney, large splashers.

[1][page needed] Between 1930 and 1931, Richard Maunsell, who was adept at improving locomotives by redesigning and simplifying them, applied his principles to all members of the class.

The infamous Drummond 'paddlebox' splashers over the driving wheels were removed to be replaced by a simple raised running plate.

[3][page needed] A further improvement was the installation of mechanical lubricators; this in tandem with the removal of the bulky "paddlebox" splashers went some way towards curing the problem of over-heated axle boxes.

[6][page needed] Under Southern Railway ownership from grouping in 1923, the locomotives were outshopped in Richard Maunsell's darker version of the LSWR Sage Green with yellow lettering on the tender, with black and white lining.

[3][page needed] This livery was continued under Bulleid despite his experimentation with Malachite Green, though the 'Southern' lettering on the tender was changed to the 'Sunshine Yellow' style.

Superheating helped to solve the problems of efficiency in terms of coal and water, whilst the removal of the splashers meant ease of access to the wheels and airflow to the axleboxes.