This version of the Whistle Stop insert is designed to hold the base game and the Rocky Mountains expansion all within the main box. The insert is composed of five trays. One tray holds the various tiles while another holds the player boards and upgrade cards.. Another tray holds the player pieces while another holds the (6) different resource cubes (for easy placement right beside the board). The last tray can also be placed right beside the board and holds the remaining tokens and shares used in the game. The board pieces (along with the dual layer Rocky Mountains boards) and manuals fit on top of the insert (as pictured).