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The Train Puzzle: Swapping the Railway Wagons

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Swap the positions of Red & Green railway wagons using the Engine.
Dimensions of the railway tracks are as shown.
Notes:
1. Engine should be back on the original track (BC) after the swap.
2. Engine can move in both directions and can push or pull the wagons.
3. Consider ∆ABC to be an equilateral triangle, with side=40m
Swap the positions of Red & Green railway wagons using the Engine.
Dimensions of the railway tracks are as shown.
Notes:
1. Engine should be back on the original track (BC) after the swap.
2. Engine can move in both directions and can push or pull the wagons.
3. Consider ∆ABC to be an equilateral triangle, with side=40m