OVERALL JOURNEY CLEANLINESS COMFORTTIME ON BOARD (OVERALL SCORE) 2019: 93.0% 2020: 93.0% 2019: 90.8% 2020: 95.4% 2019: 93.4% 2020: 95.7% 2019: 93.5% +2.3 p.p. +2.2 p.p. +2.0 p.p.+2.2 p.p. 55 Surveys are conducted once every two months for a total of six surveys per year and entail 5,000 interviews with a sample of passengers selected using a probability-based procedure in connection with three different aspects: traffic, station and brand.