Updated, 9:21 a.m.

Good morning on this mellow Thursday.

Be on the lookout for a train with 10 subway cars that have been covered in bright blue, purple, green, orange and yellow.

The train — which is alternating between the E and F lines in Brooklyn, Manhattan and Queens — is decorated with the words “SUBWAY LIBRARY.”

Inside those 10 cars, the seats resemble books on a shelf.

Beginning today, the Subway Library will offer commuters six weeks of free downloadable books from the city’s public libraries.

But you don’t need to be in a library car to take advantage. When you enter a subway station, connect to the Transit Wireless WiFi network available at all underground stations. When you’ve logged on, you’ll see a prompt for SubwayLibrary.com, and — voilà — you can start browsing and downloading books, short stories, chapters and excerpts donated by publishers to the New York Public Library.