NevilleChaimberlin: Before opining, can you please read the posts?
I have said- constantly- that escalators, Shabbos elevators and yes, public transport-if it is free- do not present an issur melocho. I did NOT say that one can use public transport nilly willy as I said there is a question of “maris ayin”. However, Shabbos elevators and escalators do not have this problem-hence one can use them -as tens of thousands of jews do around the world.