Federal Railroad Administration, DOT § 229.73

articulated connection pins to prevent vent the truck and body the pin from falling out of place in case from separating in case of derailment. of breakage. (c) A truck may not have a loose tie bar or a cracked or broken center cast- SUSPENSION SYSTEM ing, motor suspension lug, equalizer, hanger, gib or pin. A truck frame may § 229.63 Lateral motion. not be broken or have a crack in a (a) Except as provided in paragraph stress area that may affect its struc- (b), the total uncontrolled lateral mo- tural integrity. tion between the hubs of the and boxes, between boxes and pedestals § 229.69 Side bearings. or both, on any pair of wheels may not (a) side bearings with exceed 1 inch on non-powered and springs designed to carry weight may friction powered axles, or 3⁄4 not have more than 25 percent of the inch on all other powered axles. springs in any one nest broken. (b) The total uncontrolled lateral (b) Friction side bearings may not be motion may not exceed 11⁄4 inches on run in contact unless designed to carry the center of three-axle trucks. weight. Maximum clearance of side bearings may not exceed one-fourth § 229.64 Plain bearings. inch on each side or a total of one-half A box shall contain inch on both sides, except where more visible free oil and may not be cracked than two side bearings are used under to the extent that it will leak oil. the same rigid superstructure. The clearance on one pair of side bearings § 229.65 Spring rigging. under the same rigid superstructure (a) Protective construction or safety shall not exceed one-fourth inch on hangers shall be provided to prevent each side or a total of one-half inch on spring planks, spring seats or bolsters both sides; the other side bearings from dropping to track structure in under the same rigid superstructure event of a hanger or spring failure. may have one-half inch clearance on (b) An elliptical spring may not have each side or a total of 1 inch on both its top (long) leaf broken or any other sides. These clearances apply where the three leaves broken, except when that spread of the side bearings is 50 inches spring is part of a nest of three or more or less; where the spread is greater, the springs and none of the other springs in side bearing clearance may only be in- the nest has its top leaf or any other creased proportionately. three leaves broken. An outer coil spring or saddle may not be broken. An § 229.71 Clearance above top of rail. equalizer, hanger, bolt, gib, or pin may No part or appliance of a locomotive not be cracked or broken. A coil spring except the wheels, flexible nonmetallic may not be fully compressed when the sand pipe extension tips, and trip cock locomotive is at rest. arms may be less than 21⁄2 inches above (c) A shock absorber may not be bro- the top of rail. ken or leaking clearly formed droplets of oil or other fluid. § 229.73 sets. (a) The variation in the circum- § 229.67 Trucks. ference of wheels on the same axle may (a) The male center plate shall ex- not exceed 1⁄4 inch (two tape sizes) tend into the female center plate at when applied or turned. least 3⁄4 inch. On trucks constructed to (b) The maximum variation in the di- transmit tractive effort through the ameter between any two wheel sets in center plate or center pin, the male a three-powered-axle truck may not ex- center plate shall extend into the fe- ceed 3⁄4 inch, except that when shims male center plate at least 11⁄2 inches. are used at the journal box springs to Maximum lost motion in a center plate compensate for wheel diameter vari- assemblage may not exceed 1⁄2 inch. ation, the maximum variation may not (b) Each locomotive shall have a de- exceed 11⁄4 inch. The maximum vari- vice or securing arrangement to pre- ation in the diameter between any two

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