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Summary
| Description |
English: Railway semaphore signal widespread after the 1850s, and still in use today, semaphore arms signaled "danger" when in the horizontal position and "all clear" when angled either up or down. Red arm is Red square-ended arm, Yellow arm is Yellow distant warning arm.
中文：臂板信号机在19世纪50年代后被广为使用并延续至21世纪，当臂板处于水平位置时，表示『危险』，臂板向上或向下时候则表示警报解除。红色为主臂板，黄色为预臂板。 |
| Date | |
| Source | Own work |
| Author | Charlie fong |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:24, 12 June 2020 | | 196 × 379 (19 KB) | Charlie fong | Uploaded own work with UploadWizard |
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