Indian locomotive class AP

Specifications
Specifications
Configuration:;
• Whyte	4-4-2
• UIC	2′B1′ n2
Gauge	1,676 mm (5 ft 6 in)
Leading dia.	3 ft 7 in (1,092 mm)
Driver dia.	6 ft 6 in (1,981 mm)
Wheelbase:
• Leading	7 ft 0 in (2,134 mm)
• Coupled	6 ft 9 in (2,057 mm)
• incl. tender	50 ft 7+1⁄2 in (15,430 mm) (3000-gal tender)
Length:;
• Over buffers	60 ft 6+7⁄8 in (18,463 mm) (3000-gal tender)
Width	9 ft 6 in (2,896 mm)
Height	13 ft 6 in (4,115 mm)
Axle load	17.25 long tons (17.53 t)
Service weight	65.00 long tons (66.04 t)
Tender weight	39.50 long tons (40.13 t)
Water cap.	3,000 or 4,000 or 4,500 imp gal (14,000 or 18,000 or 20,000 L; 3,600 or 4,800 or 5,400 US gal)
Firebox:
• Grate area	32 sq ft (3.0 m2)
Boiler pressure	180 psi (12.4 bar; 12.7 kgf/cm2)
Heating surface:
• Firebox	1,057 sq ft (98.2 m2)
• Tubes	1,880 sq ft (175 m2)
• Total surface	2,037 sq ft (189.2 m2)
Cylinders	Two, outside
Cylinder size	19 in × 26 in (483 mm × 660 mm)

Type and origin
Type and origin
Power type	Steam
Designer	British Engineering Standards Association
Builder	Vulcan Foundry (28); North British Locomotive Co. (18); Kitson and Company (12);
Total produced	58

BESA class AP
BESA class AP
	EIR locomotive No. 120, built by North British Locomotive Company
Power type
Type and origin
Power type	Steam
Designer	British Engineering Standards Association
Builder	Vulcan Foundry (28); North British Locomotive Co. (18); Kitson and Company (12);
Total produced	58
Configuration:;
Specifications
Configuration:;
• Whyte	4-4-2
• UIC	2′B1′ n2
Gauge	1,676 mm (5 ft 6 in)
Leading dia.	3 ft 7 in (1,092 mm)
Driver dia.	6 ft 6 in (1,981 mm)
Wheelbase:
• Leading	7 ft 0 in (2,134 mm)
• Coupled	6 ft 9 in (2,057 mm)
• incl. tender	50 ft 7+1⁄2 in (15,430 mm) (3000-gal tender)
Length:;
• Over buffers	60 ft 6+7⁄8 in (18,463 mm) (3000-gal tender)
Width	9 ft 6 in (2,896 mm)
Height	13 ft 6 in (4,115 mm)
Axle load	17.25 long tons (17.53 t)
Service weight	65.00 long tons (66.04 t)
Tender weight	39.50 long tons (40.13 t)
Water cap.	3,000 or 4,000 or 4,500 imp gal (14,000 or 18,000 or 20,000 L; 3,600 or 4,800 or 5,400 US gal)
Firebox:
• Grate area	32 sq ft (3.0 m2)
Boiler pressure	180 psi (12.4 bar; 12.7 kgf/cm2)
Heating surface:
• Firebox	1,057 sq ft (98.2 m2)
• Tubes	1,880 sq ft (175 m2)
• Total surface	2,037 sq ft (189.2 m2)
Cylinders	Two, outside
Cylinder size	19 in × 26 in (483 mm × 660 mm)
Operators
Career
Operators	East Indian Railway Company; North Western Railway; Eastern Bengal Railway;

The Class AP was a broad gauge tender steam locomotive introduced around 1907 for passenger trains on the railways in British India. Its class designation, AP, stands for Atlantic Passenger Locomotive, where Atlantic refers to the wheel arrangement of the same name. It was one of the BESA locomotives developed by the British Engineering Standards Committee, later called the British Engineering Standards Association (BESA).