This is New Mexico’s new commuter rail way. It is appropriately called The Rail Runner. Service started in July of this year and was free for the first 3 months. Starting November 1st they will be charging $2.00 for a one way trip, $3.00 for a round trip and $50.00 for a monthly pass.
The Rail Runner travels from US 550 on the north end to Belen on the south end. Albuquerque is right about in the middle. See a map here.