Are the freight trains that run through various parts of town on any sort of regular schedule?

There's a couple train crossings, most notably the one that runs across Bellaire near 610, where I periodically get stuck waiting. I've vaguely noted that one seems to come through mid afternoon, but I'm not sure if that's just coincidental timing on my part, and/or if that applies on a regular daily schedule.

I'm poking around to see if there's a posted schedule anywhere so I can start avoiding those routes during those times of day.