Federal Railroad Administration, DOT § 229.77

§ 229.69 Side bearings. on wide flange wheels may not be less 1 (a) Friction side bearings with than 53 inches or more than 53 ⁄4 inches. springs designed to carry weight may (d) The distance back to back of not have more than 25 percent of the flanges of wheels mounted on the same 1 springs in any one nest broken. axle shall not vary more than ⁄4 inch. (b) Friction side bearings may not be § 229.75 Wheels and tire defects. run in contact unless designed to carry weight. Maximum clearance of side Wheels and tires may not have any of bearings may not exceed one-fourth the following conditions: inch on each side or a total of one-half (a) A single flat spot that is 21⁄2 inch on both sides, except where more inches or more in length, or two ad- than two side bearings are used under joining spots that are each two or more the same rigid superstructure. The inches in length. clearance on one pair of side bearings (b) A gouge or chip in the flange that under the same rigid superstructure is more than 11⁄2 inches in length and 1⁄2 shall not exceed one-fourth inch on inch in width. each side or a total of one-half inch on (c) A broken rim, if the tread, meas- both sides; the other side bearings ured from the flange at a point five- under the same rigid superstructure eighths inch above the tread, is less may have one-half inch clearance on than 33⁄4 inches in width. each side or a total of 1 inch on both (d) A shelled-out spot 21⁄2 inches or sides. These clearances apply where the more in length, or two adjoining spots spread of the side bearings is 50 inches that are each two or more inches in or less; where the spread is greater, the length. side bearing clearance may only be in- (e) A seam running lengthwise that is creased proportionately. within 33⁄4 inches of the flange. (f) A flange worn to a 7⁄8 inch thick- § 229.71 Clearance above top of rail. ness or less, gauged at a point 3⁄8 inch No part or appliance of a locomotive above the tread. except the wheels, flexible nonmetallic (g) A tread worn hollow 5⁄16 inch or sand pipe extension tips, and trip cock more on a locomotive in road service 3 arms may be less than 21⁄2 inches above or ⁄8 inch or more on a locomotive in the top of rail. switching service. (h) A flange height of 11⁄2 inches or § 229.73 Wheel sets. more measured from tread to the top of (a) The variation in the circum- the flange. ference of wheels on the same axle may (i) Tires less than 11⁄2 inches thick. not exceed 1⁄4 inch (two tape sizes) (j) Rims less than 1 inch thick on a when applied or turned. locomotive in road service or less than (b) The maximum variation in the di- 3⁄4 inch on a locomotive in yard service. ameter between any two wheel sets in (k) A crack or break in the flange, a three-powered-axle truck may not ex- tread, rim, plate, or hub. ceed 3⁄4 inch, except that when shims (l) A loose wheel or tire. are used at the journal box springs to (m) Fusion welding may not be used compensate for wheel diameter vari- on tires or steel wheels of locomotives, ation, the maximum variation may not except for the repair of flat spots and exceed 11⁄4 inch. The maximum vari- worn flanges on locomotives used ex- ation in the diameter between any two clusively in yard service. A wheel that wheel sets on different trucks on a lo- has been welded is a welded wheel for comotive that has three-powered-axle the life of the wheel. trucks may not exceed 11⁄4 inch. The di- ameter of a wheel set is the average di- ELECTRICAL SYSTEM ameter of the two wheels on an axle. (c) On standard gauge locomotives, § 229.77 Current collectors. the distance between the inside gauge (a) Pantographs shall be so arranged of the flanges on non-wide flange that they can be operated from the en- wheels may not be less than 53 inches gineer’s normal position in the cab. or more than 531⁄2 inches. The distance Pantographs that automatically rise between the inside gauge of the flanges when released shall have an automatic

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