Terminal 4 is the exclusive international customs arrival terminal. The Schengen terminal, and formerly the "only" Terminal 2. Airport shuttle buses transport passengers between Terminal 1 and Terminal 2. The J section is for bus transportation between the terminal and aircraft parked at aprons. The Infotower is a observation tower located adjacent to the northern cargo terminal. Also shown is a "loop" connection terminal. Railroad stations such as Grand Central Terminal and Pennsylvania Station helped fuel suburban growth. Bus stations are situated opposite both Terminal 1, 2 and 3. The Red Line has a station at each of Terminal 3 and Terminal 1. Passengers are transported by bus between Terminal 3 and the IFC. Lufthansa also operates a dedicated first class terminal at Frankfurt Airport. Adding a terminal or teletype completed the system. Emirates Airline operates from only Terminal 3. The suburban Savyolovsky Rail Terminal was built in 1902. This added international facilities to the existing domestic passenger terminal.