Final answer:
Granville Woods's invention of the Synchronous Multiplex Railway Telegraph was significant because it enabled communication with moving trains, enhancing safety and coordination in the railway industry.
Step-by-step explanation:
The invention of the Synchronous Multiplex Railway Telegraph by Granville Woods is significant because it allowed for messages to be sent to and from moving trains for the first time. This was a considerable advancement in communication and train safety, as it improved coordination and helped reduce accidents by enabling communication between train stations and moving trains. Though the telegraph was initially invented by Samuel Morse in the 1830s and was used to send messages over long distances using Morse Code, Woods' invention specifically addressed the challenge of moving train communication, marking a significant achievement in the railway industry.