| Powertype: | Steam |
| LNER Class Y1 | |
| Designer: | Sentinel Waggon Works |
| Builder: | Sentinel Waggon Works |
| Builddate: | 1925-1933 |
| Totalproduction: | 24 |
| Whytetype: | 0-4-0 geared tank |
| Driverdiameter: | 2inchesft6inchesin (ftin) |
| Wheelbase: | 7feet |
| Locoweight: | Y1/1, 20.35LT Y1/2, 19.8LT Y1/3, 14LT Y1/4, 19.35LT |
| Fueltype: | coal |
| Cylindercount: | two |
| Cylindersize: | NaNinchesx9inchesin (xin) |
| Boiler: | 2inchesftNaNinchesin (ftin) (all but Y1/2) 3inchesft1inchesin (ftin) (Y1/2) |
| Firearea: | 3.97square feet (all but Y1/2) 5.1square feet (Y1/2) |
| Fireboxarea: | 26.7square feet (all but Y1/2) 35square feet (Y1/2) |
| Totalsurface: | 64.15square feet (all but Y1/2) |
| Tubearea: | 27.73square feet (all but Y1/2) 36.5square feet (Y1/2) |
| Superheaterarea: | 9.72square feet (all but Y1/2) |
| Boilerpressure: | 275psi water tube boiler |
| Fuelcap: | 0.6LT0.8LT |
| Watercap: | 300impgal |
| Tractiveeffort: | 68130-68142 and 68152-68153: 7260lbf 68143-68151: 8870lbf |
| Operator: | London and North Eastern Railway, British Railways |
| Disposition: | 1 preserved, remainder scrapped |
The LNER Class Y1 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 1925. They passed into British Railways ownership in 1948 and were numbered 68130-68153 [1] but 68134 was withdrawn almost immediately and may not have carried its BR number.
The superheated vertical water-tube boiler and the engine were similar to those used in Sentinel steam wagons. There were variations within the class as regards boiler size and fuel capacity and these were denoted by sub-classes Y1/1 to Y1/4.
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 engines had a gear ratio of 11:25 and some 9:25. Tractive effort was:
There is disagreement between sources. According to LNER Encyclopedia [6] there were six Y1/1s and sixteen Y1/2s.