Rails to rebuild

You are a man or women working with about 78 other people to rebuild civilisation via the railway, you onto have access to steam locomotives and old 4 and 5 plank wagons, also only British rolling stock and locomotives, all the equipment you have is salvaged, you and everyone with you live at an old freight depot that had a large shed/kitchen and barracks that was used a long time ago before you all got there, you start with a small 0-4-0 pannier tank and several pieces of rolling stock like 2 vans, and 3 4 plank trucks in, it's a post apocalyptic world where alot of the population has died but large forests still exist