I want to model a sand/stone/gravel dealer, bringing in those materials in open hoppers. I'm wondering if anyone can point me to pictures on the net of the trackwork between the piers of an open pit which those materials would be dumped in. I figure steel rod and turnbuckles or some such thing would be used to keep the rails in gauge since there would be no ties where the hopper dumps. Also need details of the top of the support piers. How long is the typical span? What supports the rails between piers? I figure it would be the same as similar structures to dump coal at coal dealerships. Any help will be much appreciated.