Editing LSWR N15 class (section)

==="Scotch Arthurs"===
As the Drummond G14 and P14 4-6-0s were rebuilt to the N15 specification at Eastleigh, a lack of production capacity due to repair and overhaul meant that Maunsell ordered a further batch of 20 locomotives from the [[North British Locomotive Company]] in 1924.<ref name=Swift-19-25>Swift (2005), pp. 19–25</ref> The company had under-quoted to gain the contract, which meant that production of the batch was rushed.<ref name=Bradley103 /> The necessity to maintain an intensive timetable on the Southern Railway's Western section prompted an increase of the order to 30 locomotives (Nos.&nbsp;E763–E792).<ref name=Bradley103 /> Their construction in [[Glasgow]] would gain them the "Scotch Arthurs" nickname in service.<ref name=Herring /> They were all delivered to the Southern Railway by October 1925, and featured the front-end refinements used on the Drummond rebuilds.<ref name=Clarke-49 />

The North British batch was built to the Southern's new composite [[loading gauge]] and differed from previous batches in having an Ashford-style cab based upon that used on the [[SECR N class|N&nbsp;class]].<ref name=Clarke-49 /> Unlike the Drummond cab retained by Nos.&nbsp;448–457 and E741–E755, the Ashford cab was of an all-steel construction and had a roof that was flush with the cab sides, allowing it to be used on gauge-restricted routes in the east of the network.<ref name=Bradley99 /> It was inspired by the standard cab developed in 1904 by [[Richard Deeley|R. M. Deeley]] for the [[Midland Railway]], and was one of a number of Midland features introduced by Clayton to the SECR and subsequently the Southern Railway.<ref name=Clarke-49 /> The smokebox door was revised to the Ashford pattern, which omitted the use of central tightening handles in favour of clamps around the circumference.<ref name=Bradley101 /> The batch was fitted with the Urie-designed, North British-built {{convert|5000|impgal|L|sigfig=3|abbr=on}} capacity double-bogie tenders.<ref name=Bradley99 />