I find some of these utilitarian railroad trestles across rivers quite satisfying.
Lancefield East angles across a shoal in the French Broad River. Keep going on this and you’ll leave Cocke County TN and hit Madison County NC in just a few miles. The trestle is 960′ long, with a handy walkway provided. I’ve been on a walkway similar to this when a train came by. I was safe enough, but that much power and sheer tonnage was certainly impressive. And loud.
You can read about this sturdy, 1894 Pencoyd Bridge & Construction Co. (PA) trestle over the Levisa Branch in Kentucky right here. It once carried two tracks, maybe when it was over the Ohio River. The website I noted above says that this bridge is closed to all traffic, but check the rails…they’ve been used recently. The actual maker plate is on the right support. It’s been broken, but it’s still readable.