A video explaining lower quadrant 2 Position Semaphore Signaling, and 2 forms of Safeworking.
Source:
https://vicsig.net/index.php?page=infrastructure§ion=signalling#2intro
https://www.victorianrailways.net/signaling/2poshom01.html
https://www.victorianrailways.net/signaling/book_of_signals1967.pdf
https://en.wikipedia.org/wiki/Railway_semaphore_signal
https://en.wikipedia.org/wiki/Interlocking
https://vicsig.net/index.php?page=infrastructure§ion=safeworking
https://www.victorianrailways.net/signaling/pointind/pointind.html
https://en.wikipedia.org/wiki/Token_(railway_signalling)
https://www.victorianrailways.net/signaling/safeworking_systems/double_line/double_line.html
https://www.railgeelong.com/safeworking.php
https://www.victorianrailways.net/signaling/signalhome.html
https://www.victorianrailways.net/signaling/gen_appendix_1979.pdf
Music:
Massobeats: Daydream
Massobeats: Honey Jam
Massobeats: Gingersweet
Massobeats: Swing
Massobeats: Floral
Massobeats: Waiting
Massobeats: Gift
Massobeats: Jasmine Tea
Massobeats: Noon
Massobeats: Drizzle
Massobeats: Lush
Massobeats: Chamomile
Massobeats: Rose Water
Massobeats: Taro Swirl
Massobeats: Peach Prosecco
Massobeats: Glisten
Massobeats: Bloom