Tweedy &
Co Tappet locking frame
Tweedy was a small Carlisle-based company that never gained a huge foothold in the signalling market. Early frames had their own patented locking, but this c1890 design adopted tappet locking.
One very distinct feature of these frames was a circular hole in the quadrant midway across the lever stroke, provided to allow easy extraction of levers during maintenance.
This type of frame has only been identified as used during widening contracts of the Cockermouth, Keswick and Penrith Railway.
This illustration is of Threlkeld, on which more details can be found in the Photo Gallery