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Nothing special required. Same as straight or curved mainline track. In the case of a helix, run the DCC bus up one of the helix risers and connect to the track at each level. Be sure to solder all rail joiners except for one pair on the side opposite of the DCC bus to yield good electrical connections, but yet leave a little room for rail movement for thermal expansion, etc. You may want to add insulated rail joiners at top and bottom of the helix to facilitate train current detector or reversing loop wiring at a later date.
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