NZR X class

NZR X class
NZR X class
Power type Steam
Builder NZR Addington Workshops
Build date 1908 - 1909, 1913 - 1915
1943 - 1949 (rebuild)
Configuration 4-8-2
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Length 56 ft 9.75 in (17.3 m)
Weight on drivers 46.7 long tons (47.4 t) (original)
45.6 long tons (46.3 t) (rebuild)
Locomotive weight 66.7 long tons (67.8 t) (original)
66.6 long tons (67.7 t) (rebuild)
Tender weight 27.3 long tons (27.7 t) (original)
28.55 long tons (29.01 t) (rebuild)
Locomotive & tender
combined weight
94.0 long tons (95.5 t) (original)
95.15 long tons (96.68 t) (rebuild)
Fuel type Coal
Fuel capacity 4.0 long tons (4.1 t) (original)
5.0 long tons (5.1 t) (rebuild)
Water capacity 2,200 imp gal (10,000 L)
Boiler pressure 230 psi (1,600 kPa) (original)
215 psi (1,480 kPa) (rebuild)
Firegrate area 37.1 square feet (3.4 m2) (original)
37.5 square feet (3.5 m2) (rebuild)
Superheater area None (original)
168 square feet (15.6 m2) (rebuild)
Cylinders 2 high pressure + 2 low pressure (original)
4 high pressure (rebuild)
High-pressure
cylinder size
13.5 × 22 in (34 × 56 cm)
Low-pressure
cylinder size
22 × 22 in (56 × 56 cm)
Top speed 30 mph (48 km/h)
Tractive effort 26,620 lbf (118.4 kN) (original)
29,500 lbf (131 kN) (rebuild)
Number in class 18
Number 439–446
588–597
Locale North Island Main Trunk
First run 1909
Last run 1957
Retired 1935–1950
Current owner Feilding & Districts Steam Rail Society (1)
Disposition Withdrawn, one preserved

The NZR X class was a pioneering class of eighteen 4-8-2 steam locomotives designed by A. L. Beattie that operated on the national rail network of New Zealand. In 1908, a heavy and powerful locomotive was required to haul traffic on the newly completed mountainous central section of the North Island Main Trunk Railway, and as a logical progression of the 4-6-2 Q class design, the 4-8-2 wheel arrangement was created for the X class.

Contents

Overview

When the first X was completed in 1908 at NZGR's Addington Workshops in Christchurch, it was the very first 4-8-2 locomotive built in the world. The 4-8-2 design went on to be popular in the United States and was nicknamed the "Mountain" type; one theory suggests this name stems from the mountainous terrain that inspired the X's design, while another suggests the Chesapeake and Ohio Railway first coined the name in reference to its 4-8-2s of 1911 that were built to operate in the Allegheny Mountains.

The X class initially operated as the freight counterpart of the passenger A class, but they struggled to operate at speeds higher than 50 km/h (30 mph). They were built as de Glehn compound locomotives, but during the 1940s, most of the class were converted to simple, superheated locomotives. This increased their power but did not prolong their lives and most were officially withdrawn from service on 2 March 1957, though a few had been taken out of service earlier and one was sold to the Ohai Railway Board (ORB) that operated a private industrial line at the end of the Wairio Branch.

Preservation

The ORB locomotive, X 442, survived and has passed into the hands of railway preservation enthusiasts. It is currently located at the depot of the Feilding and District Steam Rail Society.

External links

References

  • Heath, Eric, and Stott, Bob; Classic Steam Locomotives Of New Zealand, Grantham House, 1993

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