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The LNER Class Y3 was a class of 0-4-0geared steam locomotives built by Sentinel Waggon Works for the London and North Eastern Railway and introduced in 1927. They passed into British Railways ownership in 1948 and were numbered 68154-68185.[1] At least one was based at Immingham in 1950.[2]
Final drive to the wheels was by sprocket chain. Some locomotives had a sprocket gear ratio of 19:19 and others 15:19. In addition, there was a two-speed gearbox but gears could only be changed while the locomotive was stationary. Tractive effort was:
Ratio 19:19, Low gear 12,600 lbf (56 kN), High gear 4,705 lbf (20.93 kN) (68154-68179 and 68184-68185)
Ratio 15:19, Low gear 15,960 lbf (71.0 kN), High gear 5,960 lbf (26.5 kN)(68180-68183)
References[]
^Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 47