All-welded

The two new steel girders to carry this track—which are of all-welded construction, and with diaphragms fixed in position weighed in all 26 tons—were next brought forward and placed in position.

In accordance with S.R. practice since the days of Bulleid, the design of components employs welding extensively - in fact the smokebox, motion and slide bar brackets and frame stretchers are all-welded structures. [p163] The most ambitious of these items were undoubtedly the all-welded boilers for the short-lived and much-discussed "Leader" 0-6-6-0s; [...]