Their bread and butter is the
Missionary Ridge Local, which is a 6-mile round trip (3 miles each way) between Grand Junction, which is where all trains depart hence all times on their website is for when the trains depart Grand Junction, and East Chattanooga, which is beyond the bridge. They run this train every month of the year, run 2-5 trains a day, though not every day of the week all year long, sometimes weekends only (like January-February), though most of the time on either select weekdays or every day of the week. In fact
every train the Tennessee Valley Railroad Museum runs passes by those houses. Plus they keep their locomotives, the cars and locomotive being used for the
Local, their shops, and they fuel all their locomotives at East Chattanooga, so trains also run by at other times of the day, normally before the first train of the day and after the last train of the day. Except for the
Local, all the equipment for their other trains are kept at the yard at Grand Junction. If you care to see what trains they run, check their website:
https://www.tvrail.com/