Western US:
- Special rules involving transcontinental networks
- Towns start with goods cubes that can be lost if the town is urbanized
- new terrain: swamps

Germany:
- Berlin always receives a cube during production
- Some hexes have very high costs so:
- the engineer halves the cost of one piece of track rather than it's usual effect
- Some zero length links

This Age of Steam expansion was originally published for Essen 2003 in a limited edition paper form by Winsome games, the Western US and Germany expansion received the full Warfrog treatment for Essen 2004 and was released formally as the #2 expansion set.