Relative (reasonably fit early 60s) needs to make a short journey. (Lift not possible so don't suggest it.) Can avoid busiest times of day.
Which would be worse - 25 minutes in a local cab (not black cab) or approx an hour on trains plus attendant hanging about at stations. Will obviously be wearing a mask, and BJ has just indicated masks now compulsory for cab drivers, iirc.
Science please!