Highland Railway X Class

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HR X class
Type and origin
Power type Steam
Designer Peter Drummond
Builder North British Locomotive Company
Serial number 18805–18808, 19013–19016
Build date 1909–1911
Total produced 8
Specifications
Configuration 0-6-4T
UIC class C2′ n2t
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Driver diameter 5 ft 0 in (1.524 m)
Trailing dia 3 ft 3 in (0.991 m)
Loco weight 69.0 long tons (70.1 t; 77.3 short tons)
Fuel type Coal
Fuel capacity 4.5 long tons (4.6 t; 5.0 short tons)
Water cap 1,970 imp gal (9,000 L; 2,370 US gal)
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Boiler pressure 180 lbf/in2 (1.24 MPa)
Firegrate area 22.5 sq ft (2.09 m2)
Heating surface 1,268 sq ft (117.8 m2)
 • Tubes 1,148 sq ft (106.7 m2)
 • Firebox 120 sq ft (11 m2)
Cylinders Two, inside
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Performance figures
Tractive effort 22,082 lbf (98.23 kN)
Career
Operators HRLMS
Class HR: X
Power class LMS: 4P
Withdrawn 1932–1936
Disposition All scrapped

The Highland Railway Drummond 0-6-4T or X class were large tank engines originally intended for banking duty. They were designed by Peter Drummond.

Construction

The first four were built by the North British Locomotive Company and delivered in 1909. A second batch of four was delivered in 1911.

Design

The design was derived from that of the class K (0-6-0) tender engines and leading dimensions were very similar although the boiler and firebox are recorded as being 'larger' but by an unspecified amount.

Reputation

They were not popular with their crews, many thought them heavy and clumsy, and several crews had problems with water capacity. It seems their axleboxes were not well-proportioned either as there are reports of consistent hot box problems.

Numbering

HR No. Built LMS No. Withdrawn Notes
39 1909 15300 December 1936
64 1909 15301 October 1934 Renumbered 66 in 1909
65 1909 15302 August 1933 Renumbered 68 in 1909
69 1909 15303 October 1932
29 1911 15304 October 1932 Renumbered 43 in 1913
31 1911 15305 November 1934
42 1911 15306 November 1935
44 1911 15307 November 1934

Transfer to LMS

They all survived to be taken over by the London, Midland and Scottish Railway (LMS) at the 1923 Grouping. The last was withdrawn in 1936.

References

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