202
moleswokth’s pocket-book
Notes on Pebmanent Way.
(Von Weber and others.)
BAILS.
The breaking weight, as well as the lateral
resistance, is greater in flange-rails than in double-
headed rails of equal proportion. Too great
rigidity of rails entails increased wear on the rails
and roiling stock. The radius of the top table is
generally too sharp, and should be increased to
24 inches.* The radius of the shoulder of the
top table should be about ’55 inch.
The angle of the fish-planes with the horizontal
plane, when the rail is upright, should be
about 30°.
The web for rails from 60 to 75 lbs. per yard
need not be more than 5 to | inch. The resist-
ance to lateral displacement is increased by the
friction between the rails and the wheels.
Rails which do not break joint have only 70 per
cent, of the lateral strength of those which break
joint.
BALLAST.
The character of the ballast has no important
effect on the lateral resistance of the permanent
way.
Filling ballast at the end of the sleepers does
not practically increase the lateral resistance.
Short piles driven at the end of the sleepers do
not increase to any appreciable extent the power
of resistance to lateral force.
* Mr. Conybeare recommends a radius of 40 inches.