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Tunnels

How do the radio signals work in tunnels ? Tabletop ( talk) 11:35, 3 July 2012 (UTC) reply

Article name is too general

"Anti-collision device" should be a disambiguation page. We could move this to Anti-collision device (Indian railways) if there is no better name ? - Rod57 ( talk) 14:34, 4 November 2020 (UTC) reply