One of the big improvements you can make to freight cars is to replace the cast-on grabs by wire ones. For box cars and similar vehicles this is comparatively easy. Just shave off the cast-on ones and substitute appropriate wire grabs from Tichy Trains, Detail Associates or one of the other suppliers. For hoppers and covered hoppers, fitting wire grabs is a big problem. The most difficult part concerns the corner posts. The many holes needed for all the wire grabs weaken the plastic so much that a breakage is almost inevitable. This article describes an alternative approach using thin plastic rod.