Do try and minimise how many levels the helix has, i.e. by making the storage level as close to the underside of the layout as is comforable for access/pointwork wiring etc. - I've seen several layouts with ridiculous gaps between levels and trains can spend ten minutes going round and round. A waste of time and the less time a train spends going uphill the less wear the drive system will have to endure...besides the driver will get a headache!
Goedel
Goedel
