For my lift up section I have used the DCC Concepts Etched sleepers, cutting out the existing sleepers and replacing with the etched sleepers soldered to the rail and using the straight Tracksetta to keep everything in line. The Etched sleepers are pinned down, so there is no expansion into the lift up gap, but you must leave as Bulliedboy says at least a credit card gap. So you should have the following, large gap, soldered Etched sleepers, large gap then repeat to come off the lift up section. Mine has just had a full week of mid 30's followed by this week where its a bit cooler in the mid to high twenties. Hope this helps Derek You could use copper clad sleepers.