When most of the stations in the London Underground system were built, disabled and wheelchair access was not considered. While many above-ground stations have only a few steps to the platform, nearly all Underground stations have some of the systems's 410 escalators and 112 lifts (elevators). Newer stations include disabled access, and many older stations install disabled access when they are refurbished or rebuilt. Since 2004, maps inside the trains show which stations have step-free access from street level. Transport for London plan to have a network of over 100 fully accessible stations by 2020, which means that 75% of Tube journeys can be made with step-free access.