The best food-and-train song I know is Dave Goulder's "Footplate Cuisine", but probably not appropriate for your gig as it will put the OAPs off their food. No time to write out all the lyrics just now as I'm on the way out, but as a taster ...

Some like a wilderbeast stewed in red wine,
Others an ostrich leg pickled in brine.
But I prefer something that died on the line
Home cooking for footplate cuisine.
I'll post the full song if no one else has, later today.