. Book of the Royal blue . • electro-pneumatic interlocking sys-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 lb2 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 doubleslip-switcheswith movable point fro
. Book of the Royal blue . • electro-pneumatic interlocking sys-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 lb2 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 doubleslip-switcheswith movable point frogs. Thereaic 106 signal levers, operating 251three-position signals and 157 two- s THE INTERIOR OF THE NEW UNION STATION AT WASHINGTON
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Keywords: ., bookauthorbaltimoreandohiorailr, bookcentury1800, bookdecade1890
