File:Railwaydoublediscsignal.png
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Summary
| Description |
中文：铁路双盘信号机，19世纪40年代出现，双盘绕木制或钢制信号杆旋转，但由于识别度不够明显，很快被淘汰。 |
| Date | |
| Source | Own work |
| Author | Charlie fong |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:40, 13 June 2020 |  | 318 × 408 (24 KB) | Charlie fong | Uploaded own work with UploadWizard |
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