or else sillinesses like having a colour for Charing Cross/Cannon Street
and then saying that the route from Dartford to Victoria is really
covered by Charing Cross services that go to Victoria, rather than have
two colours along the Bexleyheath line.

This is bad, wrong, and i will not be doing it.

In the end, the grouping of services by TOC (or former BR division) is
more likely to correspond to some kind of operational reality without
creating incredible complication.

No, colouring by terminus is fine, as i will soon demonstrate!


In a similar vein, in reality, some London Bridge services do extend
to Charing Cross and they come from the same places and are run by the
same operator that is the main user of the London Bridge terminus.

Would you be completely pure about it and consider them to be Charing
Cross services, and have three parallel colours down a relatively
minor branch like Caterham?

Also (did someone already ask?) what colour will you use when trains
travel from one terminus to another, eg London Bridge to Victoria by a
number of different routes at various times, currently two main ones?

I admire your determination, but this is going to be a very difficult
task.