London & North Western Railway Tumbler locking
frame
The LNWR maintained its individuality by building nearly all of its own lever frames, to its own unconventional but rugged design.
This type was manufactured in large quantities from 1876 through to the introduction of tappet locking in 1906.
The most distinct feature of LNW frames is the front-mounted "stirrup" to operate the catch mechanism. Despite this unconventional arrangement, the sturdiness of the design has ensured that large numbers of this type are still in use today.
This example is at Widnes No.7, more details of which can be found in the Photo Gallery.