I'Anson lever frame
A little-know signalling contractor of this name supplied locking frames to the Central Division of the North Eastern Railway over the period 1867 to around 1887.
The interlocking of these was of I'Anson's own design, of two types: pre- and post-1869.
Many of these frames were curiously numbered when first installed, with numbers, letter and combinations of both. This is best explained by a typical example - see below. Most frames were renumbered in conventional fashion at a later date.
The detail of these frames can vary, but distinct identification features include relatively tall levers with smallish catch handles. The patent specified at steel spring plate between lever and catch-handle but all known examples featured a conventional gravity catch block. Quadrant plates varied in style but normally included only one catch guide.
Small numbers of this type survived to recent years; the example shown left was at Eastgate ground frame, whilst that below was at Oak Tree.
