"I bless this train..."

I've seen some strange things of the tube before: a carriage full of Santas, and quiz time at Earl's Court station; but today was a definite first. A man got into the carriage, where I was stood on my way to Green Park on the Piccadilly line, and with what I assume was a gold Catholic cross started blessing the carriage. He then hopped off and managed to get on the next carriage just before the doors closed. It was absolutely bizarre. Everyone around me gave each other quizical looks with supressed smirking. Words failed me at the time. Did this man know something we didn't? Was he doing what he thought to be his Christian duty, or perhaps he was employed by Transport for London. We shall never know, but it reminded me to always expect the unexpected when out and about in London.