gordonT wrote on 02 October 2012 20:34:48 ...
Are there not a fair few stations in continental Europe which have a
"main" series of numbers for their "ordinary" platforms, say 1-14, and
have a couple of randomly chosen "high" numbers, say 41-42 for
platforms served by some oddball operation such as a tram-train run by
a different operator in an underground or semi-detached overground bit
of the station?

Gare du Nord in Paris is like that. It has 1-21 for
regional/inter-city/international trains, 30-36 for suburban trains, and
below them 41-44 for the RER (Crossrail equivalent).

Gare de Lyon has the oddest platform numbering: the original train shed
has platforms A to N; a separate group of platforms is numbered 5 to 23,
odd numbers only.
--
Richard J.
(to email me, swap 'uk' and 'yon' in address)