This track is approximately 155' around, the curves having a nominal radius of 11'. It climbs 5" from the far end of the straight and around the reverse curves, then level around the near end to descend on the straight. It is dual O and 1 gauge and I put in the climb and fall to help clockwork locos make as much distance as possible. It works, my 90 year old Hornby NORD Atlantic managed 145' on its own and 130' with two wagons lit. This actually is the first steam run on the new track. A second gauge 1 loop will be added soon.