Lumber

is a recurring ST: and TotK: in.

Lumber is for sale in Whittleton for only 50 Rupees. However, Link is unable to afford it if he does not have the Freight Car yet, and by the time he does, the seller needs Goron Iron to polish the tools he uses to cut the trees and find his merchandise. The Goron Iron can be purchased in Goron Village for 100 Rupees and brought to Whittleton to solve this problem.

With the lumber available, Link can carry it to Anouki Village to help the Anouki build a fence. Even then, however, the young hero still has to bring Kenzo from the ST: so that the fence build can start. The reward for these deeds is a Force Gem that activates Spirit Tracks giving access to the Snowdrift Station.