Any questions about designing a model railway layout or problems with track work.
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I also found an answer in this thread: Peco 00 track confusion:
I think you're confusing the two distinct types of track and points that Peco make?
They make Setrack (STxx prefix) which matches Hornby and Bachmann UK track items. This has natural parallel track
centres of 67mm when two points form a cross-over.
They also produce Streamline points and flexible track (Prefixed SLxx). Streamline has a different track spacing of 50mm between two parallel tracks. Note: Streamline points in OO comes in two variations too! Insulated frog (Like all Setrack and all Hornby points) or Elecrofrog which need a little more installation work. Those with Electrofrogs are prefixed as SL-Exx., Then there are two rail heights in Streamline OO track. Code 100 (This is the same as Setrack and Hornby etc) or Code 75 which has a smaller rail height. Code xx is the height of the rail in thousandths of an inch. Code 75 is considered to be more fine scale rail then Code 100, but older rolling stock (say pre 1995ish) wont run well on code 75 track as the wheel flanges touch the rail fixing car tops!
For matching with Hornby OO track look for ST prefixed items. If you want to use larger radius points then use the Streamline range SL prefixed but if its to fit into Hornby or Peco Setrack geometry then you will need to add a short piece of track to increase the track spacing to 67mm where a cross over or other point work is used.
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