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Railroad Glass Colors and "Cobalt Blue" - Railroadiana Online
The danger lay in the unavoidable breakage of a given red glass roundel or lens falling out of the signal or lamp thus giving a white light or a false clear. Many lives were lost due to this exact occurrence on railroads over many years. The worst of such disasters happened on the P.R.R. in 1915 when a cracked red roundel fell out of it's semaphore spectacle giving that fatal false clear indication. A high speed passenger train collided with the rear of a stopped train on the mainline as a result.
railroad  safety  signalling  lens  disaster  1915 
6 days ago by oog

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