Timesaver
Model railroad train shunting puzzle / From Wikipedia, the free encyclopedia
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Timesaver is a well-known[1] model railroad switching puzzle (U.K. English: shunting puzzle) created by John Allen.[2] It consists of a specific track layout, a set of initial conditions, a defined goal, and rules which must be obeyed while performing the shunting operations.
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The standard layout consists of a simple yard, with five switches (three lefthand, two righthand), five spurs, and a runaround track at the center. [3] Power is supplied to the track, sufficient to run a locomotive at a fixed slow speed, controlled by a simple center-off reversing switch. Several freight cars are placed on the track, and the object is to move all of them to clearly marked destination positions.