Highland Railway X Class

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.

HR X class
Type and origin
Power typeSteam
DesignerPeter Drummond
BuilderNorth British Locomotive Company
Serial number18805–18808, 19013–19016
Build date1909–1911
Total produced8
Specifications
Configuration:
​
 • Whyte0-6-4T
 • UICC2′ n2t
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.5 ft 0 in (1.524 m)
Trailing dia.3 ft 3 in (0.991 m)
Loco weight69.0 long tons (70.1 t; 77.3 short tons)
Fuel typeCoal
Fuel capacity4.5 long tons (4.6 t; 5.0 short tons)
Water cap.1,970 imp gal (9,000 L; 2,370 US gal)
Firebox:
 • Firegrate area		22.5 sq ft (2.09 m2)
Boiler4 ft 6+1⁄4 in (1.38 m)
Boiler pressure180 lbf/in2 (1.24 MPa)
Heating surface1,268 sq ft (117.8 m2)
 • Tubes1,148 sq ft (106.7 m2)
 • Firebox120 sq ft (11 m2)
CylindersTwo, inside
Cylinder size18+1⁄2 in × 26 in (470 mm × 660 mm)
Performance figures
Tractive effort22,082 lbf (98.23 kN)
Career
OperatorsHR → LMS
ClassHR: X
Power classLMS: 4P
Withdrawn1932–1936
DispositionAll scrapped

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.BuiltLMS No.WithdrawnNotes
39190915300December 1936
64190915301October 1934Renumbered 66 in 1909
65190915302August 1933Renumbered 68 in 1909
69190915303October 1932
29191115304October 1932Renumbered 43 in 1913
31191115305November 1934
42191115306November 1935
44191115307November 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 The last was withdrawn in 1936.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
    • Baxter, Bertram (1984). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 4: Scottish and remaining English Companies in the LMS Group. Ashbourne, Derbyshire: Moorland Publishing Company. p. 200.
    • Haresnape, Brian; Rowledge, Peter (1982). Drummond Locomotives, a pictorial history. Shepperton, Surrey: Ian Allan Limited. ISBN 0-7110-1206-7.
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