. Electric railway journal . ing meanings. A, reversing switch; and D, calling keys 223, 241 and 421; E, telephone receiver;F, selectors; G, semaphore relays; H, local battery; I, induc-tion coil; /, buzzer; K, wires to semaphore magnet; L, M andN, wires to answer-back 223, 241 and 421. The semaphore atstation A is in the clear position and latched; that at station Bin the stop position and mechanically locked; that at station Cin the stop position but unlocked and ready to be cleared. As illustrating the operative ability of selective telephonetrain dispatching it may be pointed out that
. Electric railway journal . ing meanings. A, reversing switch; and D, calling keys 223, 241 and 421; E, telephone receiver;F, selectors; G, semaphore relays; H, local battery; I, induc-tion coil; /, buzzer; K, wires to semaphore magnet; L, M andN, wires to answer-back 223, 241 and 421. The semaphore atstation A is in the clear position and latched; that at station Bin the stop position and mechanically locked; that at station Cin the stop position but unlocked and ready to be cleared. As illustrating the operative ability of selective telephonetrain dispatching it may be pointed out that there are on steamroads a number of circuits in excess of 250 miles, and on theSeaboard Air Line there is one circuit of 276 miles with fifty-two Gill selectors in service on it. The dispatcher-controlledsignals will work as far as a telegraphic impulse can be effectiveand should prove reliable on the longest circuits which theinterurban electric lines will present. Two of these semaphore signals have recently been installed. Signal System—The Selector on the Indianapolis & Cincinnati Traction Companys interurbanline, which consists of two branches extending from a pointjust outside of Indianapolis, one to Connorsville, a distance of58 miles, and the other to Greensburg, a distance of 49 dispatchers office is at Junction, near Indianapolis, and thesemaphore signals are at Rushville, 37 miles from the dis-patchers office, and at Shelbyville carhouse, 22 miles from thedispatchers office. This is an road, the trolley current being3300 volts, 25 cycles, and the static charge on the telephone lineis very great. One of these lines was so noisy that it was diffi-cult to telephone over it, but the experience with the semaphoresand the four selective stations installed shows that the selectivesignaling equipment will operate satisfactorily over a line whichis hardly fit for talking. A party of Indiana interurban man-agers went over this line on May 12 to inspect these t
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