Passage: The trail runs in an arc between Middlemarch and Clyde, along the route of the former Otago Central Railway. The trail has become a popular tourist attraction, with 10,000-12,000 users per year as a conservative estimate, and yearly (and ongoing) user increases for 6 out of the last 7 years (as of 2011). The trail is also accepted as being, by a large margin, the biggest non-farming economic factor in the Maniototo-Alexandra area.

Question: Based on this passage, where does the rail trail start and end?
Steam of consciousness below:
The important part for answering this question is: The trail runs in an arc between Middlemarch and Clyde, along the route of the former Otago Central Railway.
So, the answer is Middlemarch and Clyde.