The bridge piers came out really well (again imho). I made them from 3/4" birch plywood cut to shape on a table saw and the corners sanded round. It took about three coats of Kilz primer before the wood grain disappeared and they were ready for the Primer Gray rattle-can. Paul Mack applied the weathering and I scribed their sides with pencil lines to simulate the boards used to make the forms (they didn't have plywood back then).

The detailed part of the backdrop is visible above the upper bridge and above the nost of BC&SJ No. 70 on the lower track. Right click and select "Open image in new tab" for a larger view.