There are 6 colors of wooden locomotives, each color representing a company. Players are dealt random hands of 5-10 (depending on number of players) locomotives, which are essentially a stock portfolio; the rest of each color are placed in a pool. On your turn, you can either increase the value of a single company by placing 1-5 locomotives from the remaining pool of that company, or you can trade one locomotive in your portfolio for one or two locomotives from the remaining pool in a company.
The game board is a map of France, with cities worth anywhere from 1-4 points, and rural hexes worth 0. Connecting to a city adds to a company's value.
The game ends when Marseille is reached by a company, or when there is only one company with locomotives remaining in the pool. Players' scores are determined by the value of each company at the end multiplied by the number of locomotives the player has for each color.