32 Book of Locomotives 



for such a title or class. Instead, we find 

 what was termed " express goods ", which 

 were, in fact, of ordinary goods design with 

 larger coupled wheels and, of course, fitted 

 with the continuous brake. 



On the South-Western and the London, 

 Brighton and South Coast we find not only 

 goods engines fitted with the passenger 

 brake, but entirely separate classes for 

 * mixed traffic " with a distinct wheel for- 

 mula, now almost extinct; this was the 

 0-4-2. There are many of them still run- 

 ning on the Southern, and a few on other 

 systems. The idea of this curious wheel 

 formula was to get an easy-running engine, 

 whose big leading wheels would take the 

 junction points quite easily, and, by having 

 a small pair of trailing wheels under the 

 fire-box, the latter could be very wide. 



There were until recently no less than 90 

 of these " mixed traffic " engines at work 

 on the western section of the Southern, and 

 they are still employed on duties for which 

 they were built more than thirty years ago. 

 Thus, in the early morning they will be 



