Editing LSWR N15 class (section)

===Maunsell's "Eastleigh Arthurs": second batch===
[[File:SR King Arthur class, 806 Sir Galeron (CJ Allen, Steel Highway, 1928).jpg|thumb|right|alt=Side-and-front view of a 4-6-0 locomotive on a turntable. A member of the crew is standing next to the front.|N15 No.&nbsp;806 ''Sir Galleron'', a member of the second "Eastleigh Arthur" batch. The locomotive is fitted to a six-wheel N&nbsp;class tender for use on restricted Central section turntables]]
With the "Scotch Arthurs" in service, the Southern Railway had an ample fleet of express passenger locomotives for its Western section routes. As part of a process of fleet standardisation, the Operating Department expressed a desire replace obsolescent locomotives on the [[Southern Railway (Great Britain)#Operations|Eastern]] and [[Southern Railway (Great Britain)#Operations|Central sections]] with the King Arthur class.<ref name=Bradley107 /> In May 1925, a batch of 25 locomotives (Nos.&nbsp;E793–E817) based upon the Scotch Arthurs was ordered for construction at Eastleigh with smaller firebox grates and improved water heating surfaces.<ref name=Clarke-50>Clarke (April 2008),  p. 50</ref> After the first 14 (Nos.&nbsp;E793–E806) were built, it was decided to discontinue construction in favour of Maunsell's new 4-cylinder Lord Nelson class design in June 1926.<ref name=Bradley107 />

The Operating Department intended to equip Nos.&nbsp;E793–E807 with six-wheel, {{convert|4000|impgal|L|sigfig=3|abbr=on}} capacity tenders for use on the former SECR lines of the Eastern section.<ref name="Haresnape60" /> These were to replace Scotch Arthurs Nos.&nbsp;E763–E772 on boat train duties.<ref name=Haresnape60>Haresnape (1983), p. 60</ref> This was because the {{convert|5000|impgal|L|sigfig=3|abbr=on}} tenders attached to Nos.&nbsp;E763–E772 were better suited to the longer routes of the Western section.<ref name=Bradley107 /> The final ten engines (Nos.&nbsp;E808–E817) were for the former LBSCR routes of the Central section, where short [[Turntable (rail)|turntables]] restricted tender size to the {{convert|3500|impgal|L|sigfig=3|abbr=on}} Ashford variety used on the N&nbsp;class.<ref name=Bradley107>Bradley (1987), p. 107</ref> After the order was changed to the Lord Nelson class design, 14 N&nbsp;class tenders were fitted to Nos.&nbsp;E793–E806 for use the Central section.<ref name=Bradley107 /> The high [[draw-gear]] (the link between locomotive and tender) of the N&nbsp;class tenders necessitated modification to the frames beneath the cab.<ref name=Clarke-50 />