NER Class R

NER Class R
LNER Class D20
Type and origin
Power type Steam
Designer Wilson Worsdell
Builder NER Gateshead
Build date 1899-1907
Total produced 60
Specifications
Configuration 4-4-0
Gauge 1,435 mm (4 ft 8 1⁄2 in)
Leading wheel
diameter		 4 ft 0 in (1.22 m)
Driver diameter 6 ft 10 in (2.08 m)
Wheelbase 23 ft 9 in (7.24 m) engine
12 ft 8 in (3.86 m) tender
45 ft 10 3⁄4 in (13.989 m) total
Axle load 19.8 long tons (20.1 t)
Locomotive weight D20/1: 54.1 long tons (55.0 t)
D20/2: 55.45 long tons (56.34 t)
Tender weight 41.2 long tons (41.9 t)
Locomotive and tender
combined weight		 D20/1: 95.3 long tons (96.8 t)
D20/1: 96.65 long tons (98.20 t)
Fuel type coal
Boiler 4 ft 9 in (1.45 m) diameter
Boiler pressure 200 psi (1.4 MPa)
later reduced to 160 psi (1.1 MPa)
Firegrate area 20 sq ft (1.9 m2)
Heating surface:
– Tubes		 638.7 sq ft (59.34 m2)
– Flues 292 sq ft (27.1 m2)
– Firebox 139 sq ft (12.9 m2)
– Total 1,318.7 sq ft (122.51 m2)
Superheater area 204 sq ft (19.0 m2)
Cylinders two inside
Cylinder size 19 in × 26 in (480 mm × 660 mm)
Valve gear Stephenson
Performance figures
Tractive effort 17,025 lbf (75.73 kN)
later reduced to 15,567 lbf (69.25 kN)
Career
Operator(s) North Eastern Railway, London and North Eastern Railway, British Railways
Power class BR: 2P
Retired 1943-1957
Disposition None preserved

The NER Class R (later, LNER Class D20) was a class of 4-4-0 steam locomotive, designed by Wilson Worsdell for the North Eastern Railway. They passed to the London and North Eastern Railway (LNER) in 1923. In 1936, some were rebuilt with long-travel piston valves and classified D20/2. The unrebuilt locomotives were re-classified D20/1.

Numbering

Forty-six D20/1 and three D20/2 locomotives passed to British Railways in 1948 and they were numbered 62340-62397 (with gaps).

Preservation

The last D20 was withdrawn in 1957 and none were preserved.

Sources

External links