| 11. | The track warrant section is protected by automatic block signals in addition to the track warrants.
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| 12. | New signaling, including the installation of block signals, was to be installed on the local tracks.
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| 13. | Cellular phones communicate with relay stations by way of radio frequencies, and hills can block signals.
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| 14. | SES used a system of transponder beacons attached to wayside block signals to enforce signal speed.
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| 15. | Separate Manual Block signal aspects existed as well.
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| 16. | In Canada, non-signaled and Automatic Block Signal ( ABS ) territories are operated according to OCS rules.
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| 17. | On line 3, the ATC system has been merged with the Automatic Block signals have been removed.
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| 18. | This binding also blocks signals in the cell that initiate the process of self-destruction ( apoptosis ).
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| 19. | Standing atop any virtual building, a viewer can see if other buildings will block signal sight lines.
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| 20. | Things like transformers will often block signals.
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