Hey guys, a coupl eof questions i hope you can answer.... 1) I have one of the newer Arnold/Rivarossi GG-1s in the rare red/blue/silver AMTRAK colors. What would work best to replace the front wheelsets? and where and what should i use for extra weight to hold the front trucks down? 2) I also have a fleet of the old Atlas/Rivarossi/ConCor heavyweight passenger cars. I am converting back from MTs as they seem to have issues staying coupled on N-Trak rails, even with extra weight. The Rivarossi designed trucks seem to be still good, but i wanted to replace the wheelsets as the original wheelsets are now shimmying all over the place and i cant get them to stay in gauge...any particular brand and which size 33-36?? Or should i get the replacement wheelsets from Atlas? (Oh, the Rapido couplers are being replaced with KATO couplers....i seldom, if ever, have problems with them) Sorry for all the queries...