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File:Railwaydoublediscsignal.png

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Railwaydoublediscsignal.png (318 × 408 pixels, file size: 24 KB, MIME type: image/png)

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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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13 June 2020

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Date/TimeThumbnailDimensionsUserComment
current16:40, 13 June 2020Thumbnail for version as of 16:40, 13 June 2020318 × 408 (24 KB)Charlie fongUploaded own work with UploadWizard

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