Step 1: I purchased a 2x6 at my local hardware store and had them cut it into 18 inch lengths. I decided to use 4 rail road ties per board and marked the positions. I used a 11/16 inch spade bit to drill the holes for the first board but found out that 3/4 inch spade bit works better on the second board. I aslo drilled two 1/4 inch holes for hanging purposes.
Step 4: Pound in the rail road spikes. This took quite a bit of effort to get them nice and tight. On my second coat rack, I learned that the holes were a bit small and my board split when I pounded the last rail road spike in. I started over and only used 3 rail road spikes spaced further apart and drilled the holes larger (3/4 inch) to avoid splitting the board.
Step 5: Polyurethane. I coated the board once, sanded and coated it again. I also covered the rail road spikes with polyurethane to make sure the rust wouldn't rub off on anything.
Here they are hanging in my son's room!