A thought has just occurred to me. I wonder when and how you are going to weather the new tracks? I think it may be easier if you put 'rust' on the rails before you glue it in place. With my layout, I glued the track down first, and ended up with great backache on painting the sides of the rails in a rust finish afterwards. Of course, if you are just going to use a spray, then it will be much easier for the weathering - I used a brush - I'm not too good at using spray paints. And on my layout, I used the old fashioned PVA and water mixture, with a small dot of washing up liquid, which, of course, has set the tracks and ballast solid. They have survived for at good forty years!