Here's UP Cheyenne, WY yard's sand tower, with the UP steam shops dwarfing it in the background: (note the overspray--this paint was so fresh, it still reeked of solvent!)
Grand Trunk Western coaling tower, now on display in Grand Haven, Michigan. And a little something about it.
here are a couple of contributions: A grain elevator in the Texas panhandle from the cab. Pushing a cut of hoppers into the Farmland elevator in Crawford, again from the cab (but a different train). And the iconic (at least around here) Tower 55 from the cab on a trip to Temple, Tx.