Unspecified 4-4-2 Locomotives in India

Class BESA/AP (Locobase 4258)

Data from [] (30 June 2003); and "The Work of the British Engineering Standards Association as Applied to Locomotives and Rolling Stock: The Standardization of Locomotives for Indian Railways", Locomotive Magazine, Volume XXV [25] (15 August 1919), pp. 120-123.

These Atlantic Passenger (AP) locomotives were part of the series of engines designed by the British Engineering Standards Association for Indian railways in the first decade of the 20th century. (See Locobase 10624 for the GIPR variant.) Like all broad-gauge BESA designs, these had Belpaire fireboxes. The LM account explained that the Belpaire firebox afforded "more steam and water capacity than the usual ...semi-circular outside firebox casing" as well as permitting "lighter direct staying instead of heavy girder stays."

LM noted that these Atlantics shared many components with the 4-6-0s. Both were designed to use either Stephenson link or Walschaert's outside constant-lead radial valve gear to actuate the slide valves. LM added that Walschaert gear had "been more generally adopted."

See the HP 4-6-0 (Locobase 4241) for full description of the BESA intention and varying views of its utility.