Caledonian Railway 0F class

Caledonian Railway 264 and 611 classes

264 Class loco 56039 shunting at Whiteinch Glasgow in 1958. Built in 1885 as CR 269, later LMS 16039 and BR 56039. Note converted wagon acting as coal tender.

Type and origin Power type Steam Designer Dugald Drummond, John F. McIntosh Builder Neilson and Company Build date 1885, 1895, 1900, 1902, 1908

Specifications Configuration: ​  • Whyte 0-4-0ST  • UIC B n2t Gauge 1,435 mm (4 ft 8 1⁄2 in) Driver dia. 3 ft 8 in (1.12 m) Length 22 ft 3 3⁄4 in (6.801 m) Loco weight 27.375 long tons (27.814 t) Fuel type coal Water cap 800 imp gal (3,600 l; 960 US gal) Boiler pressure 140 psi (970 kPa) Cylinders two Outside Cylinder size 14 in × 20 in (360 mm × 510 mm)

Performance figures Tractive effort 10,601 lbf (47.16 kN)

Career Class 0F

The Caledonian Railway 264 and 611 classes were 0-4-0 saddle tank locomotives designed by Dugald Drummond and built by Neilson and Company in 1885. Later examples were built at St. Rollox railway works under the direction of John F. McIntosh in 1895, 1900, 1902 and 1908.

These small shunters remained in long service under the LMS (who designated all Neilson saddle locomotives as Class 0F) and British Railways, with the last of the class withdrawn in 1962. The 0F class, sometimes referred to by the generic term "pugs", were mainly used as works shunters in the area around Glasgow, Scotland, often running with home-made tenders to improve their small coal capacity. Like most 0-4-0 tanks of the period they had outside cylinders and inside slide valves driven by Stephenson valve gear. A number were later sold into private industry and several even made it as far south as Crewe where they acted as works shunters in British Railways days. None of the various 0F class locomotives have survived into preservation.

They are easily confused with the earlier 1882-built ex-North British Railway Class Y-9 (NBR Class G), also designed by Dugald Drummond to a similar saddle tank design, although the 0F is distinguished by a taller chimney and larger circular windows. Both were originally commissioned from Drummond by Neilson & Co to a standard design and were used by North British, LNER and British Railways. One NBR Y-9 shunter (No.42 68095) has been preserved at the Bo'ness & Kinneil Railway museum.