4 MAIN DETAIL DIFFERENCES

1 ‘A1X’ rebuild

LBSCR chief engineer Douglas Marsh ((box out plus pic 5. Credit))

designed a new boiler for the ‘Terriers’. With the dome further forward, it also boasted a larger, drum-head smokebox, which required an all-new smokebox saddle, rendering the distinctive wingplates redundant. Most – but not all – also received new sandboxes under the running plate. Rebuilding started in 1911 and the locomotives were reclassified from ‘A1’ to ‘A1X’. Rebuilds to ‘A1X’ standard were carried out by companies that had bought second-hand ‘Terriers’.

2 Condensing apparatus

The ‘Terriers’ were originally fitted with condensing apparatus, whereby exhaust steam was diverted from the smokebox back into one tank, across the boiler and through the other before being exhausted. This helped raise the feedwater temperature to improve thermal efficiency and thus save coal. However, the travelling public was then showered in hot, sooty water. Stroudley’s successor, Billinton, had the apparatus removed… but Marsh had it reinstalled.

3 Extra step

As well as extended bunkers, three Isle of Wight ‘Terriers’ received extra footsteps in front of the tanks. A complementary handrail was fitted to the front of the tanks. The extra steps and handrails were fitted to the three ‘Terriers’ that remained on the island after 1936 (BR Nos. 32640, 32646 and 32677). The extra steps and handrails were fitted to

No. 32662, which was never an island ‘Terrier’, presumably during the same works visit as when it received the island extended bunker.

4 conversions 2-4-0T

The LBSCR trialled two ‘Terriers’ on push-pull duties in 1905. As well as receiving push-pull gear, Nos. 81 Beulah and 82 Boxhill were converted to 2-4-0Ts. The original splashers and sandboxes were initially retained but the latter was later moved to behind the leading wheel. Both locomotives were detuned, with cylinder dimensions reduced and Boxhill’s boiler pressure reduced to just 130lbs/sq in. Both were rebuilt as 0-6-0Ts in 1913.