The gauge is intended to enable
modellers to set up or check the buffer heights on locos, 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.
The gauge is placed on an
appropriate piece of track either on or off the layout, ensuring the vertical
sections are not resting on a chair or rail fixing. Place the item of rolling
stock against the appropriate end of the gauge and, with your eye level with the
upper edge of the slot, observe whether the centre of the buffers, buffer
housings or holes in the buffer beam are in line with the upper edge of the
slot. Adjustment is then made to the vehicle until they do align.