The gauge is intended to enable
modellers to set up or check the buffer heights on locomotives, coaches and wagons. It
includes a space to clear Alex Jackson couplings.
There are two ends to the
gauge, one with the generally accepted 14mm (3’6”) height and the other with
the GWR dimension of 3’5½“ (13.83mm). The ends also have marks for buffer
centres, a nominal 23mm (5’9”) at the 14mm end and again the GWR dimension of
5’8½" (22.83mm) at the other end.
The gauge enables a quick and simple method
of checking buffer heights ensuring buffer heights are comparable on all items
of rolling stock which enhances running and helps prevents derailments.