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4-4-0 Tank
D50
D51

Drummond D51 (NBR Class R) 4-4-0T Tank Engines

NBR No. 98 Drummond D51 (NBR Class R) 4-4-0T

The D51s were the last passenger tank locomotives designed by Drummond for the North British Railway (NBR). A total of thirty locomotives were built in five batches between 1880 and 1884, including a final batch of six built by Reid.

Between 1908 and 1911, Reid fitted new boilers of the type he had already fitted to the Drummond J82 0-6-0T locomotives.

The D51 tanks were mainly used on the suburban services around Edinburgh and Glasgow, and on the various NBR branch lines. Early on, these also sometimes operated mainline stopping services. Nos. 10456, 10458, 10461, and 10462 were fitted with cowcatchers at both ends when working the Fraserburgh to St. Combs branch.

Withdrawals started at Grouping in 1923, and the last three D51s were withdrawn in 1933.

Technical Details

The following details describe the D51s as they entered LNER ownership, with the Reid boilers.

Cylinders (x2): 16x22in.
Motion: Stephenson slide valves
Boiler: Max. Diameter: 3ft 10in
Pressure: 140psi
Diagram No.: 86
Heating Surface: Total: 666.06 sq.ft.
Firebox: 79.96 sq.ft.
Tubes: 586.10 sq.ft. (142x 1.75in)
Grate Area: 13.75 sq.ft.
Wheels: Leading: 2ft 6in
Coupled: 5ft
Tractive Effort: 11,170lb (@ 85% boiler pressure)
Total Wheelbase: 17ft 10.5in
Engine Weight: 35 tons 4cwt (full)
Max. Axle Load: 12 tons 12cwt
Coal Capacity: ~1 ton 13cwt
Water Capacity: 655 gallons

Preservation

The last three D51s were withdrawn in 1932 and none survived into preservation.

Models

London Road Models sell an etched 4mm scale (OO gauge) kit of the D51.

Locomotives

Twenty four of the D51s carried names, but lost them by about 1884. The names were:

1st NBR No.Name
19Strathendrick
33Bellgrove
52Dirleton
60Airdrie
67Clarkston
72Morpeth
73Rothbury
74Coatbridge
75Sunnyside
98Aberfoyle
99Roxburgh
101Anstruther
103Montrose
104Roslin
105Penicuik
109Uddington
110Kinross
111Clackmannan
147Slamannan
174Lennoxtown
225Milngavie
268Bothwell
294Clydebank
299Hamilton

Acknowledgements

Thank you to the Mike Morant Collection for the photograph of NBR No. 98.



 
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