4-6-2 Class 8P Merchant Navy rebuilt SR Profile and Models

4-6-2 Class 8P Merchant Navy rebuilt SR

35018 'British India Lines' at York in August 2021. ©CA850

The SR Merchant Navy 4-6-2s were a class of steam locomotive with an unusual air-smoothed casing, designed for use on the Southern Railway network by Oliver Bulleid. The design incorporated a number of new developments in British steam technology, with the locos featuring the use of welding in the construction process (one of the first in the UK), thermic syphons within the boiler and Bulleid’s controversial chain-driven valve gear. Named after Merchant Navy shipping lines, the locos also earned several enthusiast nicknames such as “Spam Cans” and “Packets”, due to their unique design. Due to problems with some of the more novel features of their design, all members of the class were modified in the 1950s and lost their air-smoothed casing in the process.

Type of Locomotive



SR Eastleigh Works

Build Date


Total Built


Tractive Effort

37,515 lbf
(later reduced to 33,495 lbf)

Wheel Configuration


Operated By

Southern Railway
British Railways

Main Duties

Express Passenger

In Service Until


Surviving Locos

10 preserved, 1 sectioned (all surviving locos modified)


Products awaiting categorisation

Scale Brand Image Construction Type DCC Capability Product Code Product Title Livery
OO Gauge (1:76 Scale) DJH Model Railway Kits K84 BR Rebuilt Merchant navy 4-6-2 Requires assembly Not set K84
BR Rebuilt Merchant navy 4-6-2 Awaiting Categorisation
OO Gauge (1:76 Scale) Keyser (K's) No image available RTR/RTUse/Pre-assembled Not set L49
Rebuilt Merchant Navy Class 4-6-2 Kit Awaiting Categorisation