Indian locomotive class HG

Indian locomotive class HG
Pakistan Railways HGS 2216 on the Khyber Pass Railway.
Type and origin Power type Steam Designer British Engineering Standards Association Builder Vulcan Foundry North British Locomotive Co. Robert Stephenson & Co. Kitson & Co. Beyer, Peacock & Co. Build date 1904-1924 Total produced More than 500
Specifications Configuration: ​  • Whyte 2-8-0  • UIC 1'D n2 (HG class) 1'D h2 (HGS/HGC class) Gauge 1,676 mm (5 ft 6 in) Leading dia. 3 ft 7 in (1,090 mm) Driver dia. Variant A: 5 ft 1+1⁄2 in (1,562 mm) Variant B: 4 ft 8+1⁄2 in (1,435 mm) Wheelbase: ​  • Coupled Variant A: 17 ft (5.2 m) Variant B: 16 ft (4.9 m)  • incl. tender Variant A with 4000 gallon tender: 51 ft 6+7⁄8 in (15.719 m) Variant B with 4000 gallon tender: 50 ft 4+1⁄2 in (15.354 m) Length: ​  • Over buffers Variant A with 4000 gallon tender: 61 ft 6+1⁄4 in (18.752 m) Variant B with 4000 gallon tender: 60 ft 3+7⁄8 in (18.386 m) Width 9 ft 6 in (2,900 mm) Height 13 ft 6 in (4,110 mm) Axle load Variant A: 16.3 long tons (16.6 t) Variant B: 15.7 long tons (16.0 t) Fuel type Coal, later converted to oil-firing Fuel capacity 7.6t of coal (3000/4000 gal tenders) 10.2t of coal (4500 gal tender) 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: ​  • Type Belpaire  • Grate area Variant A: 35 sq ft (3.3 m2) Variant B: 32 sq ft (3.0 m2) Boiler pressure 180 psi (12.4 bar; 12.7 kgf/cm2) Superheater Classes HGS & HGC: Schimdt Cylinders Two, outside Cylinder size Variant A: 21 in × 26 in (533 mm × 660 mm) Variant B: 20 in × 26 in (508 mm × 660 mm)[1] Valve gear Walschaerts Valve type Slide (HG class) Piston (HGS/HGC class)
Performance figures Tractive effort Starting at 11.2 bar boiler pressure: * Variant A: 146 kN (33,000 lbf) * Variant B: 134 kN (30,000 lbf)
Career Operators Indian Railways Pakistan Railways Locale British Raj (until 1947) India (from 1947) Pakistan (from 1947) Retired Up until 2006 Preserved 2 (India) 4 (Pakistan) At least six preserved, remainder scrapped.

The Class HG (Heavy Goods) is one of seven standard classes of broad gauge steam locomotives designed by the British Engineering Standards Association (BESA) for use in the British Raj in the mid-1900s.

This design was used by various railway companies of the British Raj, later passing on to Indian Railways and Pakistan Railways after the partition, the latter of which continued using these locomotives into the 21st century to haul the Khyber Steam Safari on the rugged Khyber Pass Railway.