An anon asks:

What is the best way to display two different lines that share a section if one acts as a local service and the other as an express service? I wanted to use ticks to represent the stations on this map, is there any approach to this problem that allows me to use it?

Transit Maps says:

The solution here is best summed up by the words of the great Massimo Vignelli, who distilled the very essence of transit diagram design down to one little quote:

“A different color for each line, a dot for every station. No dot, no station. Very simple,” 

And if you’re using dots as your station markers, it really is that easy, as shown by Vignelli’s own New York Subway map (the 2008 version is shown above), where the express patterns of the 2 and 3 compared to the 1, for example, are easily distinguishable.

Using ticks as station markers does make things a little trickier. You’ll note that the London Underground map separates routes that run along the same track but have different stopping patterns, so there’s absolutely no chance of confusion. I show the section of the Metropolitan Line and Jubilee Line above, but it also occurs on the Picadilly/District Lines west of Earl’s Court. If the route lines touched each other, a tick could be interpreted as belonging to all the lines at that station, so the London approach really is for the best, I feel.