As far as i know your not allowed to take a compressed air tank on public transport (your not even allowed stuff like a tin of dulux paint). As the underground and docklands railway would be the easist way to get the the excel centre i imagine alot of players would use it (each with atleast one airtank). Not saying that people would be stopped and searched or even that the train companies give a sh*t but that technicaly its against the law.im sorry what????
As this is purly hypothetical then theres no problem