Comments on: Logic Puzzles (Requirement:Algorithm) Railway Engineering? http://www.amusingmathpuzzles.com/logic-puzzles/logic-puzzles-requirementalgorithm-railway-engineering Math Puzzles Keeps Your Mind Agile, Making Math Fun Fri, 03 Dec 2010 04:53:14 +0000 hourly 1 By: Nick C http://www.amusingmathpuzzles.com/logic-puzzles/logic-puzzles-requirementalgorithm-railway-engineering/comment-page-1#comment-1955 Nick C Sun, 15 Mar 2009 23:19:59 +0000 http://www.amusingmathpuzzles.com/logic-puzzles/logic-puzzles-requirementalgorithm-railway-engineering#comment-1955 I'm not going to go into detail as to how I would do it, but as a clarfication, and maybe even a hint, are you allowed to move the engine through the tunnel?? I might actually confuse you and myself if I tried to explain the answer in writing but I think that allowing the engine to go through the tunnel might unlock some answers of your own. Well, if it is allowed, here is my solution: Move the engine forward and then switch the tracks so that the engine can move towards carriage A. Then pull carriage A to the initial position of the engine by switching the tracks. Then move the engine to the initial position of carriage A, again switching the tracks, and this time continue through the tunnel. Then pick up carriage B and move it back to the inital position of carriage A by again switching the tracks. Then go back and pick up carriage A and move it to the initial position of carriage B. A visual might be easier to understand. I didn't however animate anything so I just used desktop icons with Jing :) http://www.screencast.com/t/snolBqOM<br><b>References : </b><br> I'm not going to go into detail as to how I would do it, but as a clarfication, and maybe even a hint, are you allowed to move the engine through the tunnel??

I might actually confuse you and myself if I tried to explain the answer in writing but I think that allowing the engine to go through the tunnel might unlock some answers of your own.

Well, if it is allowed, here is my solution:

Move the engine forward and then switch the tracks so that the engine can move towards carriage A. Then pull carriage A to the initial position of the engine by switching the tracks. Then move the engine to the initial position of carriage A, again switching the tracks, and this time continue through the tunnel. Then pick up carriage B and move it back to the inital position of carriage A by again switching the tracks. Then go back and pick up carriage A and move it to the initial position of carriage B.

A visual might be easier to understand. I didn't however animate anything so I just used desktop icons with Jing :)

http://www.screencast.com/t/snolBqOM
References :

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