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Summary
| Description |
English: Ball signal is the most common signal on the early railways, the ball(Red) gave rise to the term "highball". When it was raised, it was safe to proceed. This was later reversed.
中文：球形型号灯属于铁路史上的早期信号器械，尤其在美国早期铁路线路中使用。英语中的术语『高球』便出于此：当球升起时，列车可安全通过。但后来表达方式反转，下降则代表通行。 |
| Date | |
| Source | Own work |
| Author | Charlie fong |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:35, 11 June 2020 | | 132 × 351 (17 KB) | Charlie fong | Uploaded own work with UploadWizard |
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