NBR 224 and 420 Classes information

Specifications
Specifications
Configuration:;
• Whyte	4-4-0
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	2 ft 9 in (840 mm) (224 Class); 3 ft 4 in (1,020 mm) (420 Class);
Driver dia.	6 ft 6 in (1,980 mm)
Wheelbase	20 ft 3+3⁄8 in (6,182 mm) (224 Class)
Adhesive weight	24.45 long tons (24.84 t) (224 Class)
Loco weight	38 long tons (39 t) (224 Class); 37.75 long tons (38.36 t) (420 Class);
Fuel type	Coal
Water cap.	1,652 imp gal (7,510 L)
Firebox:
• Grate area	15.75 sq ft (1.463 m2) (224 Class)
Heating surface:
• Firebox	87 sq ft (8.1 m2) (224 Class)
• Tubes	894 sq ft (83.1 m2) (224 Class)
• Total surface	981 sq ft (91.1 m2) (224 Class)
Cylinders	Two, inside
Cylinder size	17 in × 24 in (432 mm × 610 mm)

Type and origin
Type and origin
Power type	Steam
Designer	Thomas Wheatley
Builder	NBR, Cowlairs
Build date	1871 (224 Class); 1873 (420 Class)
Total produced	2 (224 Class); 4 (420 Class)

NBR 224 and 420 Classes
NBR 224 and 420 Classes
	224 Class, as built
Power type
Type and origin
Power type	Steam
Designer	Thomas Wheatley
Builder	NBR, Cowlairs
Build date	1871 (224 Class); 1873 (420 Class)
Total produced	2 (224 Class); 4 (420 Class)
Configuration:;
Specifications
Configuration:;
• Whyte	4-4-0
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	2 ft 9 in (840 mm) (224 Class); 3 ft 4 in (1,020 mm) (420 Class);
Driver dia.	6 ft 6 in (1,980 mm)
Wheelbase	20 ft 3+3⁄8 in (6,182 mm) (224 Class)
Adhesive weight	24.45 long tons (24.84 t) (224 Class)
Loco weight	38 long tons (39 t) (224 Class); 37.75 long tons (38.36 t) (420 Class);
Fuel type	Coal
Water cap.	1,652 imp gal (7,510 L)
Firebox:
• Grate area	15.75 sq ft (1.463 m2) (224 Class)
Heating surface:
• Firebox	87 sq ft (8.1 m2) (224 Class)
• Tubes	894 sq ft (83.1 m2) (224 Class)
• Total surface	981 sq ft (91.1 m2) (224 Class)
Cylinders	Two, inside
Cylinder size	17 in × 24 in (432 mm × 610 mm)
Operators
Career
Operators	North British Railway
Numbers	224, 264, 420–3
Withdrawn	1914–19
Disposition	All scrapped

The NBR 224 and 420 Classes consisted of six steam locomotives of the 4-4-0 wheel arrangement built by the North British Railway (NBR) in 1871 and 1873. No. 224 had three claims to fame: it was the first inside-cylinder 4-4-0 engine to run in Great Britain;^[4] it was the locomotive involved in the Tay Bridge disaster;^[5] and after rebuilding in 1885, it was the only compound-expansion locomotive on the NBR, and one of just three tandem compounds in Britain.^[6]

Intended for express passenger trains on the Edinburgh–Glasgow, Edinburgh–Carlisle, and Burntisland–Dundee routes, they handled these well. When trains from London to Edinburgh began to be forwarded via Carlisle over the NBR in mid-1876, these heavier trains were beyond the locomotives' capabilities, and they had to be removed from front-line service on the Carlisle line. Rebuilt between 1885 and 1897, they remained in service until 1914–19.

^ Ahrons 1987, p. 195.
^ Highet 1970, pp. 88–90.
^ SLS 1970, pp. 66–68.
^ Boddy et al. 1968, p. 5.
^ Rolt & Kichenside 1982, p. 98.
^ Ahrons 1987, pp. 260, 262.

[FOOTNOTEAhrons1987195-1] Ahrons 1987, p. 195.

[FOOTNOTEHighet197088–90-2] Highet 1970, pp. 88–90.

[FOOTNOTESLS197066–68-3] SLS 1970, pp. 66–68.

[FOOTNOTEBoddyBrownFryHennigan19685-4] Boddy et al. 1968, p. 5.

[FOOTNOTERoltKichenside198298-5] Rolt & Kichenside 1982, p. 98.

[FOOTNOTEAhrons1987260,_262-6] Ahrons 1987, pp. 260, 262.

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