File:Collars on automatic signals.png

From Bradshaw, the companion guide to On Our Lines

Collars_on_automatic_signals.png ‎(153 × 144 pixels, file size: 1 KB, MIME type: image/png)

Automatic signals protecting an AHB with ineffective collars

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current05:24, 14 February 2021Thumbnail for version as of 05:24, 14 February 2021153 × 144 (1 KB)Jack (talk | contribs)

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