Steam Barons is the first supplement release in the Steam game line.
Most importantly there is a whole new way to play Steam, instead of players only running a single company they now compete for ownership of the various companies with the primary shareholder in each company deciding the actions of that company each turn. As the game progresses the fortunes of the various companies will fluctuate, it

There are two new maps designed with six player games in mind and additional track tiles to ensure that the supply is unlikely to run out. The two maps are of the North of England and the majority of the USA East of the Rocky Mountains.

This game also contains wooden train markers that can be used to mark track ownership instead of the disks in the Base and Standard Steam game.

Steam Barons contains:

. 1 double-sided game board . 6 Company displays . 38 Railway track tiles . 32 money tokens
. 1 first player marker
. 16 black goods cubes
. 144 wooden train track ownership markers
. 1 Stock-market game card
. 1 full-color rules

• Players: 3-6
• Ages: 12+
• Playing Time: 120+ minutes