Maximum height level to level 80mm Set of seven piers in different heights clip to the underside of Hornby track to create a smooth incline straight or curved Piers have grooves to accept R660 elevated track sidewalls The minimum track running length to a height of 80mm with supports at 24 sleeper intervals is Approx. 1344mm However for a more gradual incline with the supports at 30 sleeper intervals the overall running length increases to Approx. 1680mm