The Mexico City subway provides affordable and accessible transportation for residents. A single subway trip costs only 2 pesos (20 cents). The subway system offers a smart card for elderly and disabled residents to use all public transit free of charge. The subway also has a rechargeable smart card that costs 10 pesos initially and can be recharged for trips costing 2 pesos each. The first two carriages of each subway train are reserved for women and children.