Henry Ernest Dudeney/Modern Puzzles/48 - Railway Shunting
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Modern Puzzles by Henry Ernest Dudeney: $48$
- Railway Shunting
- How are the trains in our illustration to pass one another, and proceed with their engines in front?
- The small side track is large enough to hold one engine or one carriage at a time, and no tricks, such as ropes and flying-switches, are allowed.
- Every reversal -- that is, change of direction -- of an engine is counted as a move in the solution.
- What is the smallest number of moves necessary?
Click here for solution
Sources
- 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Arithmetical and Algebraical Problems: Locomotion and Speed Puzzles: $48$. -- Railway Shunting
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Geometrical Problems: Moving Counter Puzzles: $374$. Railway Shunting