I used to experience sociology by getting on the train in Waukegan IL with all the black and hispanic "help", and then heading south through the posh suburbs of Chicago's north shore...the maids and such would get off at each stop and gradually be replaced by businessmen who were so homogenous they all looked like penguins, in dark suits, trenchcoats, briefcases...
when we got downtown I would be the only economically disadvantaged person still on the train. on the way home the whole process would go in reverse; I would arrive home with working class people and the occasional drunk who didn't know where the fuck he was going.