am thinking of doin tefl course
That is probably your best bet. Starting off by teaching EFL is a good way of making contacts and paying the rent.
As for your rail industry experience, well, I suppose that after you've taught for a couple of years you could get together with somebody hooked in and try to market English for Specific Purposes (railway English) courses. Or start running summertime tours of Poland to look at things like Polish steamtrains (which still operate regular schedules services in Poland).