Talk:Jules/@comment-71.125.1.211-20151121022228/@comment-71.210.15.101-20151121030153

You load a steam loco with Lumberjack cars and keep sending it. If you can send to 2 (or more) contracts, try to find others that need lumber. Delivering the cars is enough for those contracts, so you can use half the wood for another contractee. If your loco carries 10 cars, send it 10 times.

Alternatively, you can send 59K wood using any car.

They offer a hint on how to complete these challenges. In the main screen, click on Contracts. (It's the icon at the bottom, looks like a scroll.) Highlight the contractee, then click on the item needed. If you don't have the item needed, it'll take you to the shop window. If you have some that are free, it'll show them to you. If they are all in use, it'll tell you so. In the last case, you'll need to free them from other trains, or remember the name and buy new ones.