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Radius 1 curves = 371mm rad.
Radius 2 curves = 438mm
Radius 3 curves = 505mm
Radius 4 curves = 572mm (new to Hornby this year, introduced by Peco last year.)

So there is 67mm between track centres; this is wider than the scaled down prototype spacing to ensure locos and coaches in particular on adjacent lines won't hit each other on curves.
All the track products by Hornby and Bachmann have this geometry, as does Peco's 'Set track' range. Peco also do a wide range of larger radius points. Their catalogues give much more detail on the geometry of track formations and I'd advise you to get one or more.

You will find scattered throughout the forum comments about various other makes of track and many criticisms of Peco. But if you are just starting out they are useful and readily available in the UK.

John Webb
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