Does Sid Meier's Railroads include Voice Over IP and how do I activate it?
Sid Meier's Railroads! includes voice-over-IP technology. All that's needed is a functioning microphone.
While playing a multiplayer game, simply press the "/" key while speaking. Playback and capture volume can be adjusted on the "Options" screen. Note that no additional open ports or network configuration are needed to use VoIP in Railroads!