John,
I can confirm that, when I still had my 'NG Sand & Gravel O14 layout, it was quite possible to run a PBL Sn3 D&RGW boxcar through the turnouts without problems. It seems that, through some sort of serendipity, both Sn3 and O14 standard track and wheels are, more or less, compatible. It was certainly not by design - the standards I created back in the 1980s were, as noted elsewhere, based on those for EM(BRMSb 1950s) 18mm, less 4mm.
A PFM C16 could even run on part of the layout, though the tight curves prevented much in the way of progress.
Roy
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On 25 Nov 2016, at 6:24 pm,
jclutterbuck2001@... [O14] <
O14@...> wrote:
?
Hi Craig,
I have had a go at comparing the NMRA standard at: against the O14 standard at:
It looks like the O14 back-to-back (min 12.4mm) will easily clear the Sn3 max Span of 12.01mm (.473")
and the Sn3 C (CN in O14 terms) min of 13.18mm (.519") just exceeds the O14 C (13.1mm max) thus it all should work.
I would be grateful if someone could check my calculations.
John
