[Inkscape] Drawing Railroad tracks

[Lyndon 'Frames' White]

Hi, I'm working on making a more readable colour version of
Isack Stewarts map from Brandon Sanderson's Alloy Of Law. (A Mistborn Novel).|
I found it a little hard to read - couldn't tell at a glance what was rail and what was rivers.

My earlier attempt was in GIMP, but i decided to start again, in Inkscape for reasons you can prob all guess at.

Here is my map, it is in SVG World Map.svg
Rail roads are currently paths in red.
It is largely unfinished.

What i want to do is repalce them with "track symbols",
Something like what is done here.
Any tips? Perhaps itcan bedone as some kind of effect on a path?, or with defs and use elements?