I suggest to open this thread where cyclists can post opening hours of stores, gas stations and grocery stores along the Transamerica Trail.
For me, it can be extremely useful to know the opening hours of stores along a route to better plan ahead in terms of food and drinks. For instance, it can be very very valuable to know if there is a 24h gas station in the next small town where I plan to sleep. I have always missed this information on my travels. Having that information I would write it directly into the maps prior to departure.
I hereby encourage other cyclists to post opening hours of stores in critical areas where supplies can be a problem. People are free to change, update and add information to the list:
Hite Park: http://goo.gl/maps/w24wW
Limited grocery store with microwave for heating frozen food. Opening hours 8am-5pm. Update: Sorry, this store is on the Western Express.
Tribune, Kansas: http://goo.gl/maps/JpBIW
At intersection HWY27 and HWY96 there is a large gas station open 24h.