Intelligence isn't the right word. There are some sort of jobs that do select for high intelligence. Any sort of work that requires abstract reasoning and no

Intelligence isn't the right word. There are some sort of jobs that do select for high intelligence. Any sort of work that requires abstract reasoning and novel problem solving is going to be inaccessible to people with lower intelligence. Rather, it should be said that tech workers are not inherently more knowledgeable in matters unrelating to tech than the general public. In this case, knowledge of train function and etiquette is in question, not intelligence. (Note also that intelligence does not confer knowledge (although it makes knowledge easier to acquire) and that it's quite easy to find examples of people with modest intelligence but exceptional knowledge. Furthermore the work/intelligence selection process only really applies in one direction; there are a lot of high intelligence people who choose jobs they find undemanding because they have different priorities or have had different opportunities in life.)