Flat-bottom

The axle-pulleys should be not less than two-and-a-half-inch wheels with flat-bottom channels or grooves.

Two standard types of flat-bottom track were introduced as early as 1949, and some 1,570 miles had been laid down to the end of 1950.

With secondhand bullhead rail almost unobtainable, the NYMR has been forced to go for new flat-bottom rail and orders are being placed; 58 fb rails are already en route to the railway.