Paris is a major rail, highway, and air transport hub. The Syndicat des transports d'Île-de-France (STIF), formerly Syndicat des transports parisiens (STP), oversees the transit network in the region. The syndicate coordinates public transport and contracts it out to the RATP (operating 347 bus lines, the Métro, eight tramway lines, and sections of the RER), the SNCF (operating suburban rails, one tramway line and the other sections of the RER) and the Optile consortium of private operators managing 1,176 bus lines.