connie in sideways
2 trolleys with small railway type wheels [built for the job ]on the rail track spaced outside of the hangar at the correct width of the main oleos and joined together with an ajustable rod and a smaller trolly with hand steering for the nose leg a/c towed by tractor onto trollies , tractor would connect to inner main trolly and the whole thing pulled sideways into hangar .In hangers 2,3,and 4 at LHR there was room for 2 a/c with their noses in opposite directions pulled in the opposite doors , a tight fit but it worked. I can't remember if we changed engines in the hangers like that most were done with the only the a/c with only the wing and engine 1//2 in the hangar not on the trolleys .this was back in around 1948[Elf and Safety would have had a field day]