My way to straighten straight RC track:
Click 2 tracks together face to face - you need to offset by 1/2 stud - they will grip each other. Use 2 tracks with similar warpage and it will cancel out.
Warm some water in a saucepan to 80-85 deg C. No need to go higher.
Put in all the pairs of tracks and swish around.
Leave until water is cold.
Leave overnight if you want to be sure that residual stresses are removed ( probably not necessary )
Pull apart and your tracks should now be perfectly straight.
