Some of my favorite route and network building games are:
- Thurn und Taxis
- Ticket to Ride (and Europe, Switzerland, and Germany)
- Through the Desert
- Cape Horn
- 10 Days in Africa (and USA, and Europe)
Some new ones that I would like to try (but either haven't played them yet, or don't own them yet):
Who knows, maybe the next few days will see some gameplay at Chateaux Turnitsa.