5.6K views · 36 reactions | Train stopped at rail bridge due to r-e-d flag. #semaphore #suspension #signal #train #reelsfypシ #reelsfbシ #line #crane #british #bd | Trains of BD | Facebook

Before radio, visual line of sight signalling with signal lamps, flags, and these physical semaphore devices were used. The concept of signaling for long distance communication is ancient and used extensively during earlier conflicts like the Napoleonic era. A version of semaphore devices survived in modern time in the form of railway signals. #WW1 #WWI #ww1history #logistics #capcut | This Day In WWI

⛳ SEMAPHORE FLAG ALPHABET SIGNALING performed by National High Schools of HINDANG, LEYTE🇵🇭 during the 2024 District Jamborally & Encampment held at Hindang Central School on October 18-19, 2024 | Lakawan PH