. Railway track and track work . 4x6 ins. The floor timbers vary indepth from 6 ins. for 4-ft. spans, to 8 ins. for 10-ft. and 12 ins. for There is a good supply of ballast, 9 ins. thick under the ties, and theface of the bank at each end is held up by planks behind the piles. Forculverts having two bents, the caps are 13 ft. long, with 13 floor timbers should be used, as on standard trestle floors. These solidfloors have the following advantages: (1) Safety from fire; (2) Low cost ofmaintenance, as repairs are small, and the lining and surfacing can be doneby the. s
. Railway track and track work . 4x6 ins. The floor timbers vary indepth from 6 ins. for 4-ft. spans, to 8 ins. for 10-ft. and 12 ins. for There is a good supply of ballast, 9 ins. thick under the ties, and theface of the bank at each end is held up by planks behind the piles. Forculverts having two bents, the caps are 13 ft. long, with 13 floor timbers should be used, as on standard trestle floors. These solidfloors have the following advantages: (1) Safety from fire; (2) Low cost ofmaintenance, as repairs are small, and the lining and surfacing can be doneby the. section gangs instead of by the bridge gangs; (3) They give an easyriding track, and (if provided with proper guard rails) there is less liabil-ity of damage in case of derailment. A plan adopted on the Richmond, Fredericksburg & Potomac Ry. to pro-tect the floors of timber structures from fire, is to fasten boards, 2 or 3 ins. converqe I to meet af\a PointZS ft -above \ Track 3xl2x/4-» %0$rMJ2:xlb$W? ofBallast underlies. Fig. 91.—Ballasted Culvert; Southern Pacific Ry. thick and 6 ins. wide, under the ties and along their ends, forming troughswhich are filled with gravel. The durability of the stringers is not affected,and the arrangement is considered preferable to the open floor. On someof the long, high trestles of the Canadian Pacific Ry., which are not likelyto be replaced by permanent structures for some years, and which are solocated as to make reconstruction difficult in case they should be destroyedby fire, the floor is protected from sparks and hot cinders by laying planksacross the ties and filling in gravel or cinders to a depth of 2y2 or 3 ins. Onlong trestles or deck bridges there should be a plank foot walk on one sideor between the tracks, or else refuge places should be provided at latter may be conveniently located where the water barrels are placedon trestles. Bridge Guard Rails. A bridge floor is a dangerous place for a derailed car or t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
