In the late 1800s and early 1900s, Granville Woods invented numerous railroad systems that are still in use today, including an electrical system trains use to communicate their location and avoid collisions. #BlackHistoryMonth - ThreadSky

nacto.bsky.social • 10 days ago

In the late 1800s and early 1900s, Granville Woods invented numerous railroad systems that are still in use today, including an electrical system trains use to communicate their location and avoid collisions. #BlackHistoryMonth