Rail key gauges, ends and side, taper, thin and thick ends, reversible for left and right, for Great Western Railway No 00M bullhead rail, March 1917. Rail key gauges 1917
Rail key gauges, three ends and side, taper, two thin and one thick ends, reversible keys, for Great Western Railway No 68D bullhead rail. Rail key gauges
Rail key gauges, two ends, taper, thin and thick ends, reversible for left and right, for Great Western Railway No 92 bullhead rail. Rail key gauges
Rail key gauges, two ends and side, taper, reversible keys, thick and thin ends, for Great Western Railway BS95R bullhead rail, 1923. Rail key gauges 1923
Rail key gauges, ends, taper, thick and thin ends, reversible for left and right, for Great Western Railway No 00 bullhead rail, November 1900. Rail key gauges 1900