[Guest]

TrainTracks.bmpI have seen this one somewhere but cannot find it here. I have tried to make a drawing with Paint. Here is an unusual picture of train tracks. A and B are two train wagons and E is the Engine.

Here are few details.

Railway Wagons- A & B are 20 ft long each.

Engine - E is 40 ft long.

Region X is 20 ft long.

Length of Region ( Y + Engine(E) + M ) is more than 100ft.

Length of Region (Z + Wagon A + R )is also more than 100ft.

Length of region (P + Wagon B + S ) is also more than 100ft.

Few Rules:

You cannot make a turn from region Z to Y. You need to go to region X first. Remember you have size limitation also. Only one wagon A or B can fit into region X. Similarly you cannot make any turn from R to S or S to R. You need to go to region T first. Same rule goes between P & M. In region N the engine and a wagon can fit it.

You can use only the Engine to pull or push the wagons. You may attach the wagons or engine if you want to.

The goal is to switch the wagons for their current position and also bring back the Engine to its original location.

Edited August 13, 2009 by sid2

[Guest]

Engine to N

Engine to B

Engine Pulls B to N (in diagram, both engine and B are in N, with Engine on right)

Back B to X and leave B in X

Engine to N

Engine To T

Engine To A

Engine Push A to B in X

Engine Pull A,B to T (in diagram, E on top, then A, then B)

Engine Push to N, Leave B in N, Engine, A in S-R

Engine Pull A to T (in diagram, E on top)

Engine Push A through Z-R into X.

Engine to T

Engine To N - attach to B

Engine Pull B to T - Engine on top

Engine Push B into Z-R and release

Engine To T

Engine To N

Engine to A in X

Engine Pull A into N

Engine Push A into S-P

Engine To N

Engine Back to Start.

[Guest]

Engine to N

Engine to B

Engine Pulls B to N (in diagram, both engine and B are in N, with Engine on right)

Back B to X and leave B in X

Engine to N

Engine To T

Engine To A

Engine Push A to B in X

Engine Pull A,B to T (in diagram, E on top, then A, then B)

Engine Push to N, Leave B in N, Engine, A in S-R

Engine Pull A to T (in diagram, E on top)

Engine Push A through Z-R into X.

Engine to T

Engine To N - attach to B

Engine Pull B to T - Engine on top

Engine Push B into Z-R and release

Engine To T

Engine To N

Engine to A in X

Engine Pull A into N

Engine Push A into S-P

Engine To N

Engine Back to Start.

[Guest]

Looks good to me.