(a): the total revenue earned by Indian Railways through passenger traffic in the months of February 2020, February 2021 and February 2022;
(b): the total number of senior citizens who travelled during the FYs 2020, 2021 and 2022 in Indian Railways; and
(c): the total amount of savings made by Indian Railways by the withdrawal of concessions for senior citizens who travelled during the FYs 2021 and 2022?