| 摘要 |
A centralized traffic control system for governing from a central office a plurality of groups of track switches and signals which are disposed along a stretch of railway track. At the central office, a plurality of switch means designates a selected control for any switch or signal in any selected group. Also, an indication storage means is provided at the central office which is responsive to the conditions of the track switches and signals at each of the field stations and also responds to indicate the occupancy of the associated trackway. The indication storage means may drive a cathode ray tube display. An electonic digital computer is also provided which includes means for storing a program comprising a plurality of sub-routines each of which is associated with a corresponding one of the groups of switches and signals, also known as field stations. When a particular control is designated at the central office for any selected one of the field stations, the particular sub-routine of the program which is associated with that particular field station is selected, and thereafter, on successive steps of the sub-routine, selected ones of the indications are interrogated in order to make possible a final determination as to whether the designated control is a permissible control. If the designated control is permissible, a code is transmitted to the selected field station to effect that control and thereafter an indication is transmitted back to the central office indicating that the control has become effective. |
