There were delays and cancellations at Portland International Airport and Bangor International Airport. Other disruptions across the state were spotty.
The automated controls aim to prevent train-to-train collisions, derailments and other hazards, and will be installed on more than 100 miles of track between Brunswick and Haverhill, Mass.
The Downeaster train between Brunswick, Portland and Boston is one of 10 possible routes that may get more fuel-efficient Airo rail cars, although they won't make their U.S. debut until 2026.
Ticket revenue was the highest in the service’s 21-year history. Riders include business travelers, tourists, families and students, bicycles and pets.