Hello all. Just had a few questions. I recently purchased a few different things from some antique flea markets. The first is a yellow (road like) sign that says: RS The guy said it means resume speed. I was wondering if that is what it really means. I also purchased what is supposively called a railroad reflector. It is about 10x8 - a metal sheath that fits over a block of wood. It has a blue reflector in the middle about the size of a softball. It is really heavy. Is it a railway reflector?