two suggestions
1. use a router rather than a table saw;
2. measure a piece of track for rail width and rail spacing.
A friend or your neighborhood hardware store [not a big box store] probably has a caliper which will make fast work of these measurements. I suspect a 1/8 inch straight router bit will do the job.
If no one else steps up, please contact me and I will give you your measurements. I'm not able to do so right now.