. Electric railway journal . istance of about miles during certain hours as aresult of the reduction in stopping points. The operatingconditions on the Prairie Avenue and Ocean Street single-track lines have also been much bettered by the installationof Chapman automatic semaphore type block signals. Onthe former line are seven turnouts, making six track blocksin a distance of i-)4 miles. Four of these blocks are cov-ered by signals and the other two are not equipped forthe reason that a clear vision exists between the ten-minute headway is operated on this line and carsare in servi
. Electric railway journal . istance of about miles during certain hours as aresult of the reduction in stopping points. The operatingconditions on the Prairie Avenue and Ocean Street single-track lines have also been much bettered by the installationof Chapman automatic semaphore type block signals. Onthe former line are seven turnouts, making six track blocksin a distance of i-)4 miles. Four of these blocks are cov-ered by signals and the other two are not equipped forthe reason that a clear vision exists between the ten-minute headway is operated on this line and carsare in service upon it for about twenty hours per clay. 6o ELECTRIC RAILWAY JOURNAL [Vol. XLII, Au. 2. The line is carried through narrow and crooked streets,and the use of the automatic signals saves time and safe-guards the service. On the Ocean Street line three blocksare equipped in a distance of miles. TUNNEL CONSTRUCTION The East Side tunnel, which will provide a short con-nection betwen the business district and a near-by but. Section A .B a^cs^t^a. Providence Improvements—Cross-Section of East Side Tunnel comparatively undeveloped section of the city, will extendfrom the intersection of North Main and Waterman Streetsto the west side of Thayer Street, a distance of 2165 ft., thegrade being per cent and the total rise 90 ft. The dis-tance between portals will be 1790 ft. A cross-section ofthe tunnel is shown in the accompanying drawing. Thetunnel is designed to accommodate two tracks spaced 11ft. on centers and is 25 ft. wide, with an arched roofcarried 17 ft. 6 in. above the top of the rail. The liningis of concrete, the roof being 18 in. and the walls 24 The roadbed is to be of rock ballast, 18 in. deepat the center, and is drained by a 4-in. tile pipe at thebottom. The cables are to be carried in ducts locatedin the side walls, splicing chambers being provided on eachside, staggered, and 160 ft. apart. An overhead trolleywill be used. POWER DEVELOPMENT The sup
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