The chairs on the British system weigh about 45 or 50 lb each on important lines, though they may be less where the traffic is light, and are fixed to the sleepers each by two, three or four fastenings, either screw spikes, or round drift bolts entered in holes previously bored, or fang bolts or wooden trenails.
The total cost per mile of such a line, including all bolts, nuts, fish-plates and fastenings, ready for laying,, delivered in the United Kingdom, is under Soo a mile.
Care should be taken that the ties or fastenings do not eventually cut into the bark as the branches swell with increased age.
The length of the chains (from rock-fastenings) is 1715 ft., and between the piers 590 ft.; the length of the roadway between the piers is 550 ft.
Over the anga is sometimes worn an overcoat called a choga; this is made of any material, thick or thin, plain or ornamented; it has one or two fastenings only, loops below the breast whence it hangs loosely to below the knees.