LNER Class Y1

4 ft 8+1⁄2 in (1,435 mm)Driver dia.2 ft 6 in (0.76 m)Wheelbase7 ft 0 in (2.13 m)Loco weightY1/1, 20.35 long tons (20.68 t)
Y1/2, 19.8 long tons (20.1 t)
Y1/3, 14 long tons (14 t)
Y1/4, 19.35 long tons (19.66 t)Fuel typecoalFuel capacity0.6–0.8 long tons (0.61–0.81 t)Water cap.300 imp gal (1,400 L; 360 US gal)Firebox:​ • Grate area3.97 sq ft (0.369 m²) (all but Y1/2)
5.1 sq ft (0.47 m²) (Y1/2)Boiler2 ft 8+1⁄2 in (0.826 m) (all but Y1/2)
3 ft 1 in (0.94 m) (Y1/2)Boiler pressure275 psi (1.90 MPa)
water tube boilerHeating surface:​ • Firebox26.7 sq ft (2.48 m²) (all but Y1/2)
35 sq ft (3.3 m²) (Y1/2) • Tubes27.73 sq ft (2.576 m²) (all but Y1/2)
36.5 sq ft (3.39 m²) (Y1/2) • Total surface64.15 sq ft (5.960 m²) (all but Y1/2)Superheater:
​ • Heating area9.72 sq ft (0.903 m²) (all but Y1/2)CylinderstwoCylinder size6+3⁄4 in × 9 in (170 mm × 230 mm)

Performance figures
Tractive effort	68130-68142 and 68152-68153: 7,260 lbf (32,300 N) 68143-68151: 8,870 lbf (39,500 N)

Career
Operators	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 They passed into British Railways ownership in 1948 and were numbered 68130-68153 ^[1] but 68134 was withdrawn almost immediately and may not have carried its BR number.

Power unit

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.

Transmission

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:

• Ratio 11:25, 7,260 lbf (68130-68142 and 68152-68153)
• Ratio 9:25, 8,870 lbf (68143-68151)

Sub-classes

• Y1/1, 68130-68135 and 68152 (total 7) ^[2]
• Y1/2, 68137, 68138, 68140-68151, 68153 (total 15) ^[3]
• Y1/3, 68139 (total 1) ^[4]
• Y1/4, 68136 (total 1) ^[5]

There is disagreement between sources. According to LNER Encyclopedia ^[6] there were six Y1/1s and sixteen Y1/2s.

Preservation

• Class Y1 number 68153 is preserved on the Middleton Railway.

References

External links

• Middleton Railway Stock List Sentinel