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I think it's for test purposes if the fixed and/or regulated 12VDC outputs don't work anymore. This output is fixed 13VAC so it might be directly connected to the secondary coil of the transformer before it is rectified by a diode bridge. With this output it is very easy to test if the transformer is broken or the electronics without opening the unit.


A user on YouTube posted the following video that tests a lot of the various train motors in Lego history for their pulling strength. The battery model train from the 1960's destroyed the competition. Pulling Power of LEGO Trains 1966 till 2009 (Systems: 4.5V 12V 9V IR) The newer engines do not have rubber traction to grip, so they have a tendency to slip ...

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