. Book of the Royal blue . TICKET OFFICES The electro-pneumatic interlocking sys-tem is installed for the safe operation oftrains on the tracks within the juris-diction of the terminal. Of thethree interlocking plants or towersthe largest or main tower is at KStreet and Delaware Avenue. Inthis tower are operated 162 the New York Avenue tower,the next in size, are fifty-eight work-ing levers and in the MassachusettsAvenue tower are twenty workinglevers. There are 108 workingswitch levers in all, operating seventy-three signal switches, five derails,eighty-six ends of double slip-switc
. Book of the Royal blue . TICKET OFFICES The electro-pneumatic interlocking sys-tem is installed for the safe operation oftrains on the tracks within the juris-diction of the terminal. Of thethree interlocking plants or towersthe largest or main tower is at KStreet and Delaware Avenue. Inthis tower are operated 162 the New York Avenue tower,the next in size, are fifty-eight work-ing levers and in the MassachusettsAvenue tower are twenty workinglevers. There are 108 workingswitch levers in all, operating seventy-three signal switches, five derails,eighty-six ends of double slip-switcheswith movable point frogs. Thereare 106 signal levers, operating 251three-position signals and 157 two- 8 THE INTERIOR OF THE NEW UNION STATION AT WASHINGTON
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Keywords: ., bookauthorbaltimoreandohiorailr, bookcentury1800, bookdecade1890
