Some thought provocation
Proto:87 tyre profile
Redrawn from that published by the MRSG 1970 and the
revision of J.S.Brook Smith 20 Aug 1995
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While the rail section is canted at 1in 20 in the prototype, this only applies to
plain track . In turnouts the rail section is normally mounted vertically.
Interestingly, we are not aware of any modeller having achieved 1 in 20 rail
cant using Vignoles rail section in 1:87 scale, but equally we are not aware of
anybody having identified that as a source of bad running qualities.
However improved running qualities have been demonstrated by using rail
profiles with correctly rounded shoulders. Perhaps this would equate to
worn profiles in the prototype.
Recently taken out of industrial service, this well worn"Tigerli" driving wheel
would not have been allowed on a public passenger railway. We wonder how
often it derailed in industrial service?