Chiming in on this; never had a problem, but bought 98% of all my FasTrack years ago. To take pins out (and then replace), is easy. Under the track, bend the tabs totally straight up on that section with a thin screwdriver and long-nose pliers. Then carefully pry up the rail itself from where it sits in the track - it's not hard, but use care, remove the offending piece and replace it, then do the opposite, exactly in reverse to get the track to sit back in its little groove.
This is also a great way to make insulated rails - just remove a rail joiner pin or two (I forget now, but same sequence for removal as 027 or 0 gauge track pin) and you will have an insulated section. You will need to buy the little pin fasteners used for track wire connectors, available from any good electronic shop. They are failsafe. Do one and you'll have the hang of it and save a lot of money on buying specialized FasTrack pieces!
