The Priest's bikes... ??? Electric using Nitrous?
Maybe that's what the masks were for.
Loved the steam punk look, but the inconsistencies in tech were unsettling. There's electricity and they're using hand cranked Victrolas to play records on, train station dude carries an oil lamp and the explosive of choice is pipe bombs? They still have computers, video and super cool stuff but they are still shoveling coal for power in one scene and wind turbines in the next.
The inconsistencies in this film that were made just to help with the look blew.
The Dude abides.