Your bank. Much industry going on there? All that seems to happen is you pay a load of money in at one end, then later on you get a load of money out at the other end. Sometimes with interest, sometimes with a fee. Depends. But from the customer perspective, ships and railways don't come into it.
But the banks seem to do alright, don't they.
Our country might not mine coal, spin cotton or build lots of ships anymore... but we are into insurance, commodities trading, research, etc. None of which are particularly tangible sources of money from a layman's perspetive, but there is plenty there! And there are industries, especially high-tech, where billions upon billions are being turned over every year, but in such obscure areas you wouldn't even think it is so profitable.
As to everyone being teachers and builders and plumbers and policemen... so far as my experience dictates they're all teachers, doctors, engineers and students!
There are all kinds of jobs out there, but if you do most of your socialising with say, 10 people, you aren't going to know people in all jobs!