This problem has lessened by some more expensive engines having two double rollers, i.e. there are four rollers on the track.
Some of the less expensive RailKing uinit have this also.
I have a pair of early 90's Weaver locos that lose power by being on a switch gap and a UCS gap at the same time, but am not aware of any double rollers being available. Woerkaround is not to go too slow, and PS2 keeps on going.
