. Electric railway journal . nd consists of124-lb., 9-in. girder rails laid on 6-in. x 8-in. x 7-ft. long-leafyellow pine untreated ties, spaced 2 ft. between centers. Theties are supported on a foundation of concrete 8 in. thick,consisting of one part cement, three parts sand and fiveparts coarse broken stone. Between the ties and sub-baseis 2 in. of i%-m. crushed stone for tamping. A concretepaving base is laid on top of the crushed stone around theties, and outside of the track this is brought up to a beight for handling large quantities of supplies. Among, theseis the use of derrick cars o
. Electric railway journal . nd consists of124-lb., 9-in. girder rails laid on 6-in. x 8-in. x 7-ft. long-leafyellow pine untreated ties, spaced 2 ft. between centers. Theties are supported on a foundation of concrete 8 in. thick,consisting of one part cement, three parts sand and fiveparts coarse broken stone. Between the ties and sub-baseis 2 in. of i%-m. crushed stone for tamping. A concretepaving base is laid on top of the crushed stone around theties, and outside of the track this is brought up to a beight for handling large quantities of supplies. Among, theseis the use of derrick cars of original design for handlingrails, sand, etc. Two of these derrick cars, one double-truck and one single-truck, are now in use and a seconddouble-truck car is under construction. The details ofthese cars are shown in the illustrations accompanyingthis article. The car has a strong underframe floored with heavyplanking and mounted upon standard trucks. At one endit carries a circular derrick track 7 ft. jl/2 in. in diameter. Buffalo Track—View Showing Derrick Car with Boom Swung Into Position for Running to suit the style of paving, the asphalt commonly used re-quiring a space of 3^ in. below the top of the rail. Contin-uous rail joints are being used, and the rails are held downwith Fetter drive screw spikes. The rods are spaced every6 ft. Below the sub-base is an 8-in. x 8-in. trench con-taining a 4-in. tile laid in a hemlock trough and sur-rounded by i%-in. crushed stone. Over this in the con-crete a drainage hole is molded every 10 ft. For this new construction the estimates called for thefollowing supplies to complete about 50 miles of single of 80-lb. T-rail. The circular track is centered directlyover one truck and it rests upon the side sill operating cab is placed on the flat car at the endopposite from the derrick track. At each end of the car isa simple drawhead. On the circular track is mounted a derrick with an and a 32-ft. boom. The derrick
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
