All depends on how many trains they are running. If there are 4 on each its a quicker interval. Less then 4, the interval goes up. We were at the MK on Sun for the final night of ELP and they were running 2 trains on express and they were on top of each other with a longer gap n between. The resort track looked like they were running 3 with about a 7 minute interval between them. If they are training a new driver, all bets are off.