LNER Class Y3

LNER Class Y3

Type and origin Power type Steam Designer Sentinel Waggon Works Builder Sentinel Waggon Works Build date 1927 Total produced 32

Specifications Configuration 0-4-0 geared tank Gauge 4 ft 8 1⁄2 in (1,435 mm) Driver diameter 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

Performance figures Tractive effort see text

Career 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.

Power unit

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.

Transmission

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)

External links

• LNER encyclopedia