I found the solution. Found it at jedi-outcast.com
09.a there are two ways to get to the trolleys. the first bit is by way of the big crate room. the crate room is reached by jumping through the upper-left garbage compactor, and proceeding through the door. a minor jumping puzzle later, and you'll be at some trolleys simply pull the first one and back-track to the main trash compactor room. once you're back, go to the only open doors and find the room with crates behind glass. to the left there will be a crate on your side of the glass on the floor, pull it and enter the secret compartment. this will eventually lead you to the other side of the trolley area where you force-push the trolley in front of you and exit to the right.