This video demonstrates adding cant to a corridor, placing 3D cells to represent sleepers that are rotated relative to the cant, then adding rails to the top of the sleepers.
Click the video below to play it. To view in fullscreen mode, first click the YouTube link at the bottom of the video to launch the video on the YouTube site. Then, click the fullscreen button (rightmost button at bottom of video).
Recorded in 1280 X 720 resolution.