Circle Engine riddle

How to interchange both bogies 1 and 2 using the Circle Engine and bring back the Engine too into the original position.

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SherlockHolmes Expert Asked on 9th August 2018 in Microsoft Interview Puzzles.
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    First unlatch bogie 2, then use the engine to go around once and get it attached to the front. Secondly unlatch bogie 1 and, once more, use the engine to go around. Allow bogie 1 to attach to bogie 2. Then unlatch both of them from the engine and make the engine go around again, but in reverse this time. After reattaching them one final time, you have it. Bogie 1 will have interchanged with bogie 2, ending with the engine still in front.

    Seeker008 Guru Answered on 21st August 2018.
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