com/definition/english/a-2-1 Do you live in an English-speaking country? "Danger Conductor Rails Alive" sounds strange to me. I would say Danger Live Conductor Rails".
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Anonymous... alive, astern, aboard. What does the "a" actually mean or do?What is does is to signal that it can't be used before a noun, i.e., attributively. It can only be used predicatively.