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(3) - Some bright management type decided that the Pennsy PL lights should have two horizontal red lamps for the stop aspect instead of three horizontal yellow, so, now the red indication seemed to "disappear" when they had fog (8) I know schools don't like to have their students use Wikipedia as a reference, but it's so convenient with that said, here's where I found my info: (1) Trains and Technology: The American Railroad in the Nineteenth Century by Anthony J Bianculli (2) New York Central RR Signals 1912-1918 by J B Calvert: The Chicago and North Western Distant Lamp by J B Calvert: Railway Signaling, a book by Brian Solomon (5) The Elements of Railroad Engineering by William Galt Raymond seems to cover just about everything, not just signals, as it lacks the details other books contain (6) Semaphores dot com website: Wikipedia on US&S: (8) Great discussion about early signals: More PRR T&HS stuff: Good historical reference site : good "old" book: Train Operation by William Nichols: id=44M5AAAAMAAJ&pg=RA1-PA157&lpg=RA1-PA157&dq=position light signal&source=web&ots=4i Pg WV4mo8&sig=g IENIp_ESZe GTx MU7Hp Kk Ywrg HU#PRA1-PA156, M1 Another good signal reference book: Railway Signaling by Everett Edgar King (1921):
It is the first time prosecutors have successfully brought charges based on someone’s intention to deliberately infect people with the virus, investigating force Sussex Police said.(1)(P.134) also (4)(P.17) (neither reference comes up with a more exact date) - The "gate signal" was developed as a crossing signal to protect the intersection of two railroads.The gate could swing to block either of the tracks, and could include a lantern for night time operation.(1)(P.149) - Controlled manual block system installed in the Park Avenue tunnel (NYC&HR - New York Central and Hudson River RR) - imported from England - called the "lock and block" or Sykes" system after its inventor - installed by US&S.(2) - From a questionnaire sent out by the Railway Signal Association, it was found that the average distance from the distant signal to the home signal was 1444 feet, and to the interlocking tower was 1750 feet - The Patenall three aspect upper quadrant semaphore signal (invented by L. Loree and Patenall this year) was adopted as standard by the ARA, and was the majority of new installations till 1940.
id=I4Q5AAAAMAAJ&pg=PA14&lpg=PA14&dq=position light signal&source=web&ots=4OYZr-Kisf&sig=Tbl Dw CGux5z Mv Nb Hi-3LVkiq9Hw#PPA11, M1 Wikipedia article on railway signaling: Reference: