Mark, the photos have succeeded because I go unnoticed or in other cases confuse people. "What does he do with that camera in his lap?" As Walker Evans noticed in his book "Many are called", people tend to relax their faces in the metro, to act as if no-one was watching. This is very interesting and this is why I do not want to bother them too much.
Thanks h.v. I think the low viewpoint is hard to do well, this was how it turned out and I am actually satisfied with many of the pictures. Satisfied enough to show them!