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I have been asked to put up a large oval track at a car show. I have the curves but not the straights, so I was thinking of routing some 8' sections of wood to make the straights and adapting them to my curves. The main concern I have is the fact that the curves will be Carrera, and have magnetic downforce, but if I use copper braid for the straights their will be no downforce.

I wonder if this will be a problem or actually enhance the race because cars will go even faster down the straights.

Also, can someone direct me to a good material to use for the rails. I do not need a flexible material since I am only running it for the straights. I have tried searching to small metal strips but they all seem too big.

I will be interested to see the replies.
In the old days routing a straight to lengthen your track was recommended. However that was with flush-mounted rails in the track (Strombecker, Revell, etc).
I think the Carrera rails are slightly elevated, where the copper tape on the wood will be flush. However, I would think that the alignment of the joint could address that so it shouldn't be a problem at all.

I would say "router on" and enjoy.......I suspect your thoughts about magnets etc might be right. ;)

my bud 2fer did this with Carrera, he just used copper tape and it has been raced on for years Im sure he will chime in and help

The transitions to Carrera track can be bumpy because of the raised rails, other than that , not too hard. Why not rout the whole thing, as a bonus, you would already have aprons.... and a spare track. I used FRP, fiberglass reinforced plastic, for my flexible walls, it came from Home Depot and was about $35 for a 4X8 sheet.