IE was going to change a tail lift cylinder hose on CM#23. They pulled a shuttle car in to block the tail up to keep it from falling but it wasn't high enough for EE to get into the spot. They raised the tail 4 to 6"" higher & EE crawled in. When IE removed the hose, the tail fell to 4 to 6"" & landed on shuttle car side rail & pinned IE under the tail.