Image: Railwayrevolvingdiscsignal
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Description: 铁路用旋转盘信号机，19世纪40年代后出现的铁路信号牌中的一种，圆盘旋转至垂直方向指示停止或通行。为了与当时绝大多数信号设备保持一致，圆盘采用木制并刷红漆。
Title: Railwayrevolvingdiscsignal
Credit: Own work
Author: Charlie fong
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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