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| Three-position block instrument This three-position block instrument indicated to the signalman the state of the line between his box and the one before. |
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| Total images: 7 | WWW.DK.COM | Help | |
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| Image | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
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| Three-position block instrument This three-position block instrument indicated to the signalman the state of the line between his box and the one before. |
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| Total images: 7 | WWW.DK.COM | Help | |