Amtrak is bringing back a domed rail car that offers panoramic views for riders of the Downeaster.

The Downeaster will begin four daily trips starting Saturday using the “Amtrak Great Dome rail car.” The rail car features an upper level with windows on all sides.

Amtrak's dome car, with the red, white and blue markings, is first in the line of passenger cars as the Downeaster travels through the Scarborough Marsh. The dome car hasn't been used on the Downeaster line before. Bill Lord/Maine HDTV

Riders will have views of the coastline, marshes and streams along the Downeaster route. The car was also used on the Downeaster line one year ago, in August and September 2016.

Seating in the dome car is available to Downeaster passengers at no extra cost, but those seats are unreserved and available on a first-come, first-served basis.

The dome car is available through Sept. 24. The Downeaster runs from Boston to Brunswick.