Stiffen your track

to secure the orange track or hot curves to your 1" x 6" base boards ;
cut a slot horizontally, with a hacksaw, in the side's vertical webbing...
heat the single trestle's upright [side] with a candle...
bend the lower sections of the sides out 90* with [2] pair of plyers...[brittle, more heat]
hacksaw off the webbing that hangs down on both sides, they not letting the trestle sit flat,,,
drill a hole in both of the "feet" created by the bent sides...
you can now screw the trestles down into the base...
this should make the track more stable.
if too much work, duct tape would probably hold the trestle down just fine...
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trestle with anchor holes , dual lane trestles are hard to find;
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you can also replace the missing front legs to a jump with the lower section of the trestles' legs ;