BNR class P

The Bengal Nagpur Railway class P was a class of four 4-8-2+2-8-4 (“Double Mountain”) Garratt locomotives. It was developed from BNR class N and BNR class NM. The Anuppur-Chirmiri section had severe curves and it needed an engine with a trailing bogie. Its boiler was slightly enlarged similar to the NM.

BNR Class P
Type and origin
Power typeSteam
BuilderBeyer, Peacock & Company
Serial number6931–6934
Build date1939
Total produced4
Specifications
Configuration:
​
 • Whyte4-8-2+2-8-4 Garratt
 • UIC(2′D1′)(2′D1′) h4t
Gauge5 ft 6 in (1,676 mm)
Driver dia.4 ft 8 in (1.422 m)
Axle load17 long tons (17 t)
Loco weight230 long tons (230 t)
Fuel typeCoal
Fuel capacity10 long tons (10 t)
Water cap.7,500 imp gal (34,000 L; 9,000 US gal)
Firebox:
 • Firegrate area		70 sq ft (6.5 m2)
Boiler pressure210 psi (1.45 MPa)
Superheater:
​
 • Heating area661 sq ft (61.4 m2)
CylindersFour, outside
Cylinder size20+1⁄2 in × 26 in (521 mm × 660 mm)
Performance figures
Tractive effort69,655 lbf (309.84 kN)
Career
Operators
Numbers
  • BNR: 855–858
  • →IR: 38855–38858
LocaleEast Central Railway zone
First run1939
DispositionScrapped

It could haul 1,500 long tons (1,500 t) load up a 1 in 91 gradient.[1]

Technical specifications
Boiler diameter7 ft 1+13⁄16 in (2.180 m)
Heating area in firebox330 sq ft (31 m2)
Boiler area3,120 sq ft (290 m2)
Adhesive weight136 tonnes
Maximum train load3165 tonnes on level track

References
  1. "5Brinkster". Archived from the original on 2013-10-23.
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