LNER Class Y3

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LNER Class Y3
Type and origin
Power type Steam
Designer Sentinel Waggon Works
Builder Sentinel Waggon Works
Build date 1927-1931
Total produced 32
 • Whyte 0-4-0 geared tank
Gauge 4 ft 8 12 in (1,435 mm)
Driver dia. 2 ft 6 in (0.76 m)
Loco weight 20.8 long tons (21.1 t)
Fuel type coal
Boiler pressure 275 psi (1.90 MPa)
water tube boiler
Cylinders two
Cylinder size 6 34 in × 9 in (170 mm × 230 mm)
Performance figures
Tractive effort see text
Axle load class Route Availability 1

The LNER Class Y3 was a class of 0-4-0 geared 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]

Power unit[edit]

The superheated vertical water-tube boiler and the engine were similar to those used in Sentinel steam wagons. The engines had poppet valves and reversing was by sliding camshaft. The advantage of the water-tube boiler was that steam could be raised much more quickly than with a conventional fire-tube boiler.


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)


  1. ^ Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 47
  2. ^ Ludlam 2016, p. 39.


External links[edit]