The Block Signal

本片由弗兰克·奥康纳导演Missouri Royer,拉尔夫·李维斯,琪恩·亚瑟主演，于未知美国上映！

This generally historic drama depicts the railroad issue of the day circa 1910-1915, when railroad signals were changing from the moving arm semaphore to simple color lights (red and green) and railroads learned many engineers were red-green color blind. This shows people losing their jobs and even a head-on collision, depicting the effect of these historic railroad improvements.