The Union Station building, bus bays, and parking garage are located on the north side of the rail viaduct adjacent to Frank B. Murray Street. The stairwells and elevators to the boarding platforms is located on the south side of the viaduct next to Lyman Street. A tunnel leads under the viaduct, allowing Union Station to be accessed from Lyman Street. The main hall in Union Station includes a waiting area for rail passengers, restaurants, retail spaces, and ticket windows for rail and intercity bus services; a PVTA local bus waiting area and an intercity bus waiting area are located in an adjacent room. Commercial space is located on the second and third floors.