. Electric railway journal . thrown betweenthe trucks of a car by a following movement under the 504 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 12 contactor; the street box is automatically sealed and isnot dependent on the proper making up of pipe jointsor gaskets; a positive anti-straddling device is provided;only 110 volts is sent into the street box; the entiremechanism can be lifted out of the street box withoutmaking any disconnections; the contactors are smalland are mounted on standard ears; and standing underthe contactor for an indefinite period has no damagingeffect on any part of t
. Electric railway journal . thrown betweenthe trucks of a car by a following movement under the 504 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 12 contactor; the street box is automatically sealed and isnot dependent on the proper making up of pipe jointsor gaskets; a positive anti-straddling device is provided;only 110 volts is sent into the street box; the entiremechanism can be lifted out of the street box withoutmaking any disconnections; the contactors are smalland are mounted on standard ears; and standing underthe contactor for an indefinite period has no damagingeffect on any part of the mechanism. Cheatham switches are located at many pointsthroughout the system. Some are placed in the loopsat carhouses, where a large number of prepayment carswith trailers are handled. Three are at ArlingtonHeights loop (where a prepayment area is to be estab-lished), and three at the Watertown carhouse. It isprobable that electric switches will be installed at stor-age turnouts in all loop tracks, as they facilitate the. SOLENOID-OPERATED TRACK SWITCHES AT COPLEY SQUARE,BOSTON, MASS. handling of cars running on five-minute headway orless. Maintenance costs of Cheatham switches for elevenmonths ending June 1, 1916, are as follows: On surface lines, outside subways, 278 switches, total for labor and materials $2, In subways north, ten switches, total for labor and ma-terials In subways south, three switches, total for labor and materials In Boylston Street subway, one switch, total labor and materials Total for 292 switches . $2, Average The Bay State Street Railway, Boston, Mass., hastwenty American automatic switches, four Collinsautomatic switches, both the product of the Unitedstates Electric Signal Company, seventeen Cheathamand three Squires electric track switches. Theseswitches are at important junction points, in the follow-ing cities and towns, where main lines converge: Bos-ton, Chelsea, Revere, Haverhill, Lawrence, Lynn, Sa-lem,
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