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Switching wires on the guide will do the trick just fine.

Switching wires from the power supply to the track will also work UNLESS it is Scalextric track with Scalextric transformer and power track section.
The reason this won't work with Scalextric is that the Scalextric transformer output is AC, which is only converted to the DC required in the power track section . Therefore swapping wires from the transformer to track will not reverse the DC current.

All other manufacturers' transformers, as well as transforming down to track voltage, also do the conversion to DC and swapping round their wires will work fine.

NOTE: None of this will work with professor Motor controllers or similar electronic units unless specifically wired for the purpose, but is fine with standard resistance type controllers.

Another way of reversing direction is to turn around the power track and plug in as normal - there are no snags with this method other than perhaps having to run the controller cables under the track to the other side.

Another way of reversing, for inline motored cars only, is to turn over the back axle so that the contrate is on the other side of the driving spur.
 

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"NOTE: None of this will work with professor Motor controllers or similar electronic units unless specifically wired for the purpose, but is fine with standard resistance type controllers."

Except for switching the wires at the guide. Just reversing polarity of the track will not work with the PM unless your PMs are fitted with the reverse polarity switch.
 
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