Nilgiri Mountain Railway locomotive No.37385, preserved at the Delhi Railway Museum
Type and origin
Power type
Steam
Builder
Swiss Locomotive & Machine Works, Winterthur, Switzerland (17) Golden Rock Railway Workshop, Golden Rock, Tiruchirappalli, India (6)
Build date
1914, 1920, 1925, 1952, 2011-2014, 2021-2022
Total produced
23
Rebuilder
Ponmalai Goldenrock (G.O.C.)
Specifications
Configuration:
• Whyte
0-8-2RT
Gauge
1,000 mm (3 ft 3+3⁄8 in) metre gauge
Driver dia.
815 mm (32.09 in)
Fuel type
Coal or fuel oil
Fuel capacity
2011: 850 litres (190 imp gal; 220 US gal) of diesel and 2,250 litres (490 imp gal; 590 US gal) of fuel oil
Cylinders
Four, outside, compound
High-pressure cylinder
Adhesion: 450 mm × 410 mm (17.72 in × 16.14 in)
Low-pressure cylinder
Rack: 450 mm × 430 mm (17.72 in × 16.93 in)
Valve gear
Walschaerts
Performance figures
Maximum speed
Adhesion: 30 km/h (19 mph) Rack: 15 km/h (9 mph)
The X class is a metre gauge 0-8-2RT rack and pinion compound locomotive used by the Nilgiri Mountain Railway in the Nilgiri Hills of southern India. They are used on the 28-kilometre-long (17 mi) section between Coonoor and Mettupalayam, where the line reachees a gradient of 8%.[citation needed] The railway uses the Abt system on these steep sections. The locomotives have two high-pressure and two low-pressure cylinders, located outside the locomotive's frames. The low-pressure cylinders drive the rack gears, and are positioned above the two main high-pressure cylinders which drive the main wheels.
This class of engine was acquired to replace the line's original Beyer, Peacock & Company 2-4-0RT rack locomotives, which were not powerful enough to handle the traffic.[1][2] The X-class locomotives were bought in two batches from the Swiss Locomotive & Machine Works, Winterthur, Switzerland. The first batch of 12 was delivered between 1914 and 1925, and the second batch of five was delivered in 1952.[1][3] Four more members of the class were built in India between 2011 and 2014. Two more were again built in India between 2021 and 2022
^ abBhandari, R. R. (2008). "Steam in history". IRFCA. Retrieved 2 March 2010.
^"Blue Mountain Railway". India for Visitors. indiaforvisitors.com. 2003. Retrieved 2 March 2010.
^"National Railway Museum". Rail in India. Retrieved 2 March 2010.
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