To maximize your puzzling space, click on the Maximize button in the lower right corner of the puzzle screen for fullscreen mode. Click on it again to return to normal mode.

For more tips, see the Online Puzzle Tips page.

CSX Transportation (CSXT) AC4400CW puzzle, based on an original photo by J.A. Muscarella (photo copyright J.A. Muscarella -- used with permission). Photographed at Columbia, South Carolina, July 31, 2017. Click here for more information about this photograph