. Railway track and track work . lows of putting a car on the main track againwithout reversing. The 5-in. trough is formed by timbers 6X6 ins., and thesand is filled 2\ ins. over the rails. In the Friedrichstadt gravity switching yard at Dresden, Germany, sandtracks were installed for stopping cars in ordinary switching work, few carshaving hand brakes; They can take care of cars at a velocity of 14 miles perhour. The cars on the two gravity tracks of , leading from the classifica-tion yards (1% grade) to the departure tracks, are controlled by portable stopblocks (Fig. 135). These are pl
. Railway track and track work . lows of putting a car on the main track againwithout reversing. The 5-in. trough is formed by timbers 6X6 ins., and thesand is filled 2\ ins. over the rails. In the Friedrichstadt gravity switching yard at Dresden, Germany, sandtracks were installed for stopping cars in ordinary switching work, few carshaving hand brakes; They can take care of cars at a velocity of 14 miles perhour. The cars on the two gravity tracks of , leading from the classifica-tion yards (1% grade) to the departure tracks, are controlled by portable stopblocks (Fig. 135). These are placed upon the rails by men stationed for thepurpose. It was desired, however, to provide some means of stopping cars ortrains which might get beyond control on the grade, so as to prevent damageto the cars or freight, and to prevent collision with trains in the yard at thefoot of the grade. For this purpose a sand track was gantletted with the runningtrack, as shown in Fig. 147. The latter track has main-line rails laid on thick. i I ,k— I4°7 —■HEnlarged Cross 147.—Sand Track for Stopping Runaway Cars. tie-plates, while the former has lighter rails, giving a difference of about in height. Guard timbers are placed on each side of the lighter rail, andthe space between them is filled with sand, covering the head of the rail by 23S TRACK. about 2 ins. for a distance of about 1,150 ft. If a car gets away, a yardmanthrows the switch of the sand track and the car is promptly stopped. It is easilyhauled back. On one occasion a freight train of 27 cars (with 55 axles), weigh-ing 417 tons with engine and tender, got beyond control on the was diverted onto the sand track while running at about 30 miles an hour,and ran for 328 ft. over a thin layer of sand and 738 ft. over a 2-in. layer. Afterthe train was stopped, the sand was cleared away and the train then ran onthrough the lower switch to the running track. The ends of the tracks in theDres
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