Because the bad guys are the bridge between the villages was destroyed. In order to recovery the transport of goods between the villages, you must assume the responsibility of rebuilding the bridge. What you do is shut in on every design can be supporting the weight of the freight train viaduct. Since the construction materials have a price, you have the money to some extent, limits your Bridge design. The slightest mistake, there will be the death of the tragic bridge destroyed car scene!
