a minimum prepayment of R$10 is required. Tickets (a disposable contactless card) are purchased from a cashier in a booth. Prepaid tickets can be topped up at the vending booths, or at automated ticket recharging machines at select stations. Cards cannot be bought at the machines, and no change is given. Cash is the only accepted means of payment on any of the sales channels. The Barra Expresso included a single ticket pass and the fare for a bus trip to Barra da Tijuca, a neighborhood located in the West Side of Rio. This integration ended when Line 4 was opened to the public. Modernization The investment of R$1.15 billion included also the purchase of 19 additional compositions; 114 new cars with a technology that allows the passengers to circulate inside the train. The first of the new compositions was scheduled to arrive in December 2010 and the others to start operating gradually before December 2011. These cars were intended for use on Line 2 and have a dimensioned air conditioning system to bear the sun and heat's direct incidence, as most part of the line is in the surface. With the increase of 63% of the fleet, the concessionaire also planned to standardize the compositions of Lines 1 and 2: all 49 trains will have six cars. The control, signalization, ventilation and energy systems will be also expanded and modernized. The energy supply for the metro's operation will be reinforced with two new proper sub-stations, at Uruguaiana and Largo do Machado Stations, and with the remodeling of São Cristóvão and Central sub-stations. On the other hand, the signalization will be automated in the two lines. Metrô Rio will enhance the ventilation at the stations and will modernize all equipment of the Control and Operations Center, from where the complete daily operation is monitored. These actions, combined with the extension of Line 2, will allow Metrô Rio to transport more than 1.1 million passengers/day. Expansion Line 4 (yellow line) was completed on 30 July 2016, connecting Barra da Tijuca neighbourhood in the West Zone, passing under São Conrado and Rocinha, to Ipanema/General Osório Station. All stations are underground, but when arriving in Barra da Tijuca, trains exit a tunnel, pass briefly by an elevated bridge and go underground again. Line 3 is proposed to connect Rio de Janeiro to Niterói via a tunnel underneath the Guanabara Bay. Network Map See