There are two parallel single-track tunnels, cross-sections of which are shown on Plate VIII of the paper by Charles M. Jacobs, M. Am. Soc. C. E. The center line is a tangent, and nearly on the line of 32d Street, New York City, produced, its course being N. 50° 30' W. The elevation of the top of the rail at the Weehawken Shaft (a view of which is shown by Fig. 2, [Plate XXII]), on the west bank of the Hudson River, is about 64 ft. below mean high water; and at the Western Portal, or Hackensack end, the rail is about 17 ft. above; the grade throughout is 1.3%, ascending from east to west. The length of each tunnel between the portals is 5,920 ft.
A general plan and profile of these tunnels is shown on Plate I of the paper by Charles W. Raymond, M. Am. Soc. C. E. At
Central Avenue a shaft 212 ft. deep was sunk. It is 3,620 ft. from the Weehawken Shaft.
PLATE XXI.
TRANS. AM. SOC. CIV. ENGRS.
VOL. LXVIII, No. 1154.
LAVIS ON
PENNSYLVANIA R.R. TUNNELS: BERGEN HILL TUNNELS.
Fig. 1. K 94. P.R.R. Tunnels, N. R. D. Section K. (Bergen Hill Tunnels.) from Hackensack Poral, North Cut and Cover Section, and Portal looking East from Sta. 323. Dec. 8, 05.
Fig. 2. K 71. P.R.R. Tunnels, N.R. Div. Sect. K. (Bergen Hill Tunnels) Method of using Cross-Section Rod in getting Sections of Tunnel. Aug. 30, 06.