Hacker News·6 min read·hard
NYC Subway Signals: A Complete Guide
A
at1as
✦AI Summary
This guide explains the technical operation of the New York City subway's wayside color-light block signaling system. It details how track circuits and insulated joints are used to detect train presence and enforce safety spacing.
Why it matters
It offers a deep dive into the legacy infrastructure that powers one of the world's largest transit systems, highlighting the transition toward modern signaling.
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technologyscience
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