RAILROAD CONSTRUCTION 329 
this track, being actuated by an endk^ss cable driven by two drums 
and a 5- by 7-inch twin engine placed above the center of the steel 
framework. Steam for the engine is piped from the locomotive. 
Both the rails and the crossties are handled by this trolley. A 
track-laying outfit comprises the track-laying machine, a flat 
car for crossties and a locomotive. In taking up track, the train 
with the track machine in front is pushed within 30 feet of the 
end of the road and the rail fastenings removed. The trolley 
is then run out to the end of the boom and a loose rail lifted by 
means of rail tongs and carried back and dropped under the frame- 
work of the machine. When both rails have been placed on the 
car, the crossties are made up into bundles containing several 
pieces, a choker is placed around them and the unit raised by 
Fig. 110. — The Norljy Track-Laying and Lifting Device.. 
the trolley and carried above the rails on the car to a flat car at 
the rear of the machine. A crew of twelve men, exclusive of 
the foreman and the locomotive attendants, can pick up or lay 
about 1800 feet of track daily. 
Another tyi:)e of track-laying and lifting machine is mounted 
on a special car with a steel framework and has two endless parallel 
chains spaced al)out 4 feet a|)art which extend from the rear of the 
machine to the ends of a cantilever arm which projects 22 feet 
beyond the trucks on the forward part of the machine. These 
chains are driven by a small reversible duplex engine, which is 
furnished with steam by the locomotive. The chains rest on 
sills on top of the car on which the crossties are piled and are 
used to carry crossties from the car to the end of the cantilever 
arm or vice versa. The crossties are raised above the chain 
by short sections of 2- by 4-inch pieces which are placed on 
the sills parallel to the chain. The rails arc; carrietl on bunks 
on both sides of the machine. When track is being taken up, 
