. Railway track and track work . Stone Drain, Brick Drain. Fig. 12.—Baltimore Belt Line Tunnel; Baltimore & Ohio Ry. In the arrangement in the Aspen tunnel of the Union Pacific Ry., Fig. 13, itwould seem desirable to keep the ballast further away from the ditches. In the ■I40 ■jzm- ■ ,3o-- -- .,...£$m •— •--■- 200. Fig. 13.—Tunnel; Union Pacific Ry. tunnels on the Everett & Monte Cristo branch of the Northern Pacific Ry., , the concrete floor forms a trough for the ties and ballast. The bottom isonly 15 ins. below level of rail head, so that there is not much ballast. Outsideof this trou
. Railway track and track work . Stone Drain, Brick Drain. Fig. 12.—Baltimore Belt Line Tunnel; Baltimore & Ohio Ry. In the arrangement in the Aspen tunnel of the Union Pacific Ry., Fig. 13, itwould seem desirable to keep the ballast further away from the ditches. In the ■I40 ■jzm- ■ ,3o-- -- .,...£$m •— •--■- 200. Fig. 13.—Tunnel; Union Pacific Ry. tunnels on the Everett & Monte Cristo branch of the Northern Pacific Ry., , the concrete floor forms a trough for the ties and ballast. The bottom isonly 15 ins. below level of rail head, so that there is not much ballast. Outsideof this trough is a rectangular ditch on each side. In the tunnels of the South& Western Ry., 18 ft. wide, the rock floor is flat, with ballast 15 ins. deep belowtop of tie; at each side is a ditch 16 ins. wide and 18 ins. deep. On the Vir-ginia Ry. there is a fall of 6 ins. in the 16-ft. rock floor to a rectangular trench ROADBED CONSTRUCTION. 23 18 ins. wide. This is filled with loose stone, in which is embedded a tile drain withopen joints. The stone is filled in to form a level bed on the tunnel floor for theordinary ballast (8 ins. deep under the ties and 12 ft. 8* ins. wide), leaving astrip of floor bare at each side. In the double-track tunnels of the SanFrancisco cut-off of the Southern Pacific Ry. th
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