| Powertype: | Steam |
| LNER Class Y3 | |
| Designer: | Sentinel Waggon Works |
| Builder: | Sentinel Waggon Works |
| Builddate: | 1927-1931 |
| Totalproduction: | 32 |
| Whytetype: | 0-4-0 geared tank |
| Driverdiameter: | 2inchesft6inchesin (ftin) |
| Locoweight: | 20.8LT |
| Fueltype: | coal |
| Cylindercount: | two |
| Cylindersize: | NaNinchesx9inchesin (xin) |
| Boilerpressure: | 275psi water tube boiler |
| Tractiveeffort: | see text |
| Axleloadclass: | 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.
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: