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Lowball was an early type of railway signal which indicated danger or a need to stop. The ball signal was a light or indicator suspended from a rope, that could move upwards and downwards, held by a weighted ball. The lowball signal was indicated when the weighted ball, and therefore signal, was at the end of its rope in the low position, indicating stop.[1]

It can also refer to:


  1. ^ Yoshinori Kon, "The Current Status of Signal Control Systems, and Research and Development" JR EAST Technical Review (Technology and Planning Department East Japan Railway Company) 3 Winter 2004:36–44 at 36–37 pdf.

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