Victorian Railways NA class

The Victorian Railways NA class is a 2-6-2 tank locomotive built for their 2 ft 6 in (762 mm) gauge branch lines.

Victorian Railways NA class
NA locomotive No. 12 at Belgrave on the Puffing Billy Railway.
Type and origin
Power typeSteam
  • BLW simple: 10-20 ¼ D
  • BLW compound: 10-13/26 ¼ D
Build date1898–1915
Total produced17
  UIC1′C1′ t
Driver2nd coupled axle
Gauge2 ft 6 in (762 mm)
Driver dia.36 in (0.91 m)[1]
  Over couplers30 ft 10 in (9.40 m)
Height10 ft 10 in (3.30 m)
Adhesive weight9 long tons 9 cwt 2 qr (21,220 lb or 9.63 t)
Loco weight35 long tons (36 t; 39 short tons)
Fuel typeCoal
Fuel capacity1.5 long tons (1,524.07 kg)
Water cap780 US gal (2,952.62 L)
Firebox typeRound-top
Boiler pressure180 psi (1.24 MPa)
Heating surface524 sq ft (48.7 m2)
Cylinder size1, 3, 5-17: 13 in × 18 in (330 mm × 457 mm)
High-pressure cylinder2 & 4: 9 12 in × 18 in (241 mm × 457 mm)
Low-pressure cylinder2 & 4: 16 in × 18 in (406 mm × 457 mm)
Performance figures
Tractive effort12,170 lbf (54.1 kN) at 80% of boiler pressure
Preserved3, 6, 7, 8, 12, 14
Disposition6 preserved, 11 scrapped

The Baldwin Locomotive Works in the United States supplied the first two 2-6-2 tank locomotives, as well as a range of spare parts. These were used to construct locomotives 3 and 4, with further examples of the class entering service up to the last, number 17, in 1915. Engines 2 and 4 used compound high- and low-pressure cylinders, while the rest of the class used simple expansion.

By the mid-1920s these small locomotives were not able to handle the increasing traffic, and two G class Garratt locomotives were purchased to supplement the fleet.

The locomotives weigh 36.58 long tons (37.17 t; 40.97 short tons) and produce a tractive effort of 12,170 lbf (54.1 kN), allowing them to haul loads of 90 long tons (91 t; 100 short tons) up grades of 1 in 30 (3.33%). Numbers 6, 7, 8, 12, and 14 have been restored and operate on the Puffing Billy Railway, and No. 3 is also on the Puffing Billy Railway, awaiting eventual restoration. The remaining locomotives have all been scrapped.

A 10 14 in (260 mm) gauge replica of a NA class locomotive was built in 1993 for use on the Isle of Mull Railway.[2] The engine, named "Victoria", was built by the Mouse Boiler Works, using drawings provided by the Puffing Billy Railway. It operated on the Isle of Mull until the railway's closure in 2011, and is currently operating on the Rudyard Lake Steam Railway.



This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.