Each photo is a little different, and since I don't have my notes handy, I'll have to work from memory. The first shot was probably done at f/5.6 for 20-30 seconds. Second shot I do recall opening up to f/4 for the duration the train was crossing the frame, probably 10-15 seconds. Third shot I started just as the gates started to ding and I cut it out just before the train came into the frame, probably 15-20 seconds and f/5.6. Last shot I do recall being worried about the amount of light, so I stopped down to f/8 for about 10-15 seconds. Hope those numbers help a bit!