With the release of the 2 special connectors interference-free 2731b and 2731a,
there was no need anymore of the cable connection holes on the electric rails,
both curved and straight, so TLG began to produce rails without the cable connection
holes.
Here are the pictures of all the bags of a MISB set.
As for the electric curved rails, you can recognize the ones without the cable
connection holes even from the back, please take a look at these 2 pictures with
the 2 different types.
Of course mixed combinations were possible too, depending on which rails TLG
had in their stocks at that time. For example see the pictures of this MISB set
below: the electric straight rails are WITHOUT the cable connection holes, while
the electric curved rails are WITH cable connection holes.
Italy, Veneto
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