Hi.
I’ve searched but can’t find the answer to this.
In the list of components it calls for 18 1.375” straight fitters (12000X.)
It also calls for 11 1.375” straight (12073).
What is part 12000X? Is it interchangeable with 12073?
Thanks!
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Andy;
The 12073 is a short track section which includes an electrically isolated center rail option (there is a removable jumper wire on the underside). Not sure about the 12000X, but it may refer to the small sections that come with Fastrack O72 switches. The 12073 are sold separately, not sure about the switch pieces, but both are the same length, however, the pieces from the switches may only have the sloped roadbed on one side or on neither side. Hope this helps.
You are correct. They are the 1 3/8 extensions that come with the 0-60 curves for this layout.
Thank you!
@AndyKL posted:You are correct. They are the 1 3/8 extensions that come with the 0-60 curves for this layout.
Thank you!
Great. That being the case, to answer your original question, the parts are not really interchangeable due to the ones that are included with the switches are missing one or both of the sloped sides 
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