(Scott Harmsen/AP)

The Wi-Fi service, known as AmtrakConnect, has already been available on Acela Express trains in the Northeast. Now it will be available for passengers from Maine to Georgia.

Amtrak estimates that with this expansion, nearly 60 percent of the train system’s riders will have access to Wi-Fi. That number will reach 75 percent when wireless Internet is added to Amtrak trains in California by the end of the year.

Amtrak announced in February that it was expanding its free wireless service. In 2010 the railroad made free Wi-Fi available on its Acela Express trains.