What is the fine-grained topic of the following text: DCNR’s year-round maintenance of the beautiful 62-mile-long rail trail includes a variety of tasks: raking and rolling the surface later each spring, trimming back vegetation from the sides, spraying for weeds on the trail surface, repairing holes and ruts and removing fallen trees and branches (especially right after violent storms), cutting down overhanging tree limbs, replacing broken fence rails, keeping the comfort stations in good shape (last year they even cleaned out the dirt, bees’ nests and other insects from the vent fans! Only return the topic.
Maintenance of the 62-mile-long rail trail by DCNR