Flying Drones Over Railroads - A Sheriff's Deputy Encounter - YouTube
Track-inspection drone rides the rails, and flies away from trains
Railway Inspection & Monitoring Using UAV/Drone Technology
Rail Insider-Railroads continue to tap drone technology to inspect track, bridges. Information For Rail Career Professionals From Progressive Railroading Magazine
The next frontier for drones: Letting them fly out of sight
Sky's the limit for Bane Nor - International Railway Journal
The Applications and Benefits of Drones in Railways - Pilot Institute
Drones taking to the railways | Food Business News | October 19, 2015 10:56