An educational application for CN employees to study USOR 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 signals name and indication.
An educational application for CN employees to study USOR 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 signals name and indication.