New York unearths paleotech relic [subway signal system].
On January 25, 2005, a fire knocked out a subway line serving large sections of Manhattan, Brooklyn, and Queens. The fire exposed a signal room containing some 600 electromechanical relays as well as signal wires, crucial components of a fixed-block signaling system that has kept proper headway betw...
| Cyhoeddwyd yn: | IEEE spectrum 42, 4(duplicate) (2005). |
|---|---|
| Prif Awdur: | |
| Fformat: | Erthygl |
| Iaith: | English |
| Pynciau: |