. Electric railway journal . London Underground Railways—Motormans Short-Circuiting Beam at right angles to the tread and forms a definite corner on thetire at the point marked X. (2) When the flange becomes more than either 3/16 in. aboveor 3/16 in. below the standard gauge of new tire. (3) When the flange at the base is less than an inch wide. (4) When the outer edge of the tread is worn or brokenaway more than in. (5) When the thickness becomes (a) on motor tires lessthan \Y% in. on tread; (b) on trailer tires less than 1% tread. Wheels are re-turned at the rate of about ssA pairs a d
. Electric railway journal . London Underground Railways—Motormans Short-Circuiting Beam at right angles to the tread and forms a definite corner on thetire at the point marked X. (2) When the flange becomes more than either 3/16 in. aboveor 3/16 in. below the standard gauge of new tire. (3) When the flange at the base is less than an inch wide. (4) When the outer edge of the tread is worn or brokenaway more than in. (5) When the thickness becomes (a) on motor tires lessthan \Y% in. on tread; (b) on trailer tires less than 1% tread. Wheels are re-turned at the rate of about ssA pairs a day perlathe. This usually averages at the rate of about 19 pairs ofwheels for every 23 shillings labor cost on the system whichprevails throughout these shops. The average cut never ex-ceeds l/i in. The process of re-tiring a single wheel involves. Worn Tires ^ r ^ »— Profile of New Tire Electric Ily. Joumai London Underground Railways—Profiles on Shop PrintCovering Allowable Wearing Limits several steps, the times for which follow: Cutting the ringsout, 75 minutes ; taking old tires off, 30 minutes ; heating newtire for shrinking and installing, 45 minutes; putting in newrings and riveting, 15 minutes; final truing up as for re-turnedwheels. The two men required to take the tires off and the
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