How fun would this be? From ComputerWorld:
BNSF has started to deploy Wi-Fi wireless LAN systems extensively in rail yards to allow crews to remotely control engines used to make up trains. These Wi-Fi systems are connected to a control panel that mimics the control panel of a diesel locomotive — “You can even blow the horn,” Campbell said — and are both more efficient and less hazardous than manned locomotives.
BNSF (Burlington Northern and Santa Fe Railway Co.) is also considering getting into the celular communications busines; they already have a huge private microwave network covering its 14,000 miles of right-of-way, and by adding celular antennas & gear to their existing towers, they can provide cel phone service to their trains and to anybody else within range of any of those towers in remote areas.