9Apps services for free Android apps. 30,000+ users downloaded CN Signals Flash Cards latest version on 9Apps for free every week! Many latest version apps provided on 9Apps too. This hot app was released on 2017-10-22. You’ll want to use it on your own phones after you know more.
An educational application for CN employees to study CROR block and interlocking signals using flash cards. One side of a presented card is the signal image, the user may then “click” to flip the card over to reveal the signal's name and indication.
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9Apps 4.9
