Earl is absolutely correct. Dirt works the best. It doesn't even need to be piled high, it just needs to extend a bit past the end of track. All that "bumpers" do is give the equipment something to climb up on tearing up air lines and brake equipment. Two cris-crossed ties is the worst as it turns the truck 45* AND climbs over them which makes it a large pain to rerail. The AT&SF in La Junta and the Denver branch used flat dirt with tapered rail ends (downward by cutting out the web for a foot) and including an "Atlas" rerailer. Picture an inside bridge pair of guard rails that come to a point away from the end of track. All a crew had to do was make a joint and pull. The rerailer steered the truck back on the track. Dirt usually works well without all that. JP