My layout is a two level, shelf layout, with a Helix. It's a switching layout, and we use Bachmann GE 70 tonners with Digitrax Decoders. We also use Digitrax DCC System. All 70 tonners have Phase 3 trucks. Our track is ME Code 70 on the Main Track, and 55 on Industry tracks., Most switches are ME Code 70, but there are some Shinahara code 70 switches on the layout as well.