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Maybe Pattern-Along-Path will do what you want:


Cheers
P

You are looking for a feature called Pattern Along Path. There are 2 ways to do it. Extensions menu > Generate from Path > Pattern Along Path is one way. But probably the best way would be the LPE (live path effect) Path menu > Path Effects > Pattern Along Path

This forum is full of examples for this -- just search "pattern along path". And there are probably more than 1 message with instructions and examples of exactly what you're doing -- making a railroad track indication on a map. Maybe search "railroad" for more specific results.

manual: )

There are alot of ways a railroad track can look related to artistic style and detail level. If you want to make it somewhat decent looking, it is not an easy go.

Can you post an example image on what you are after?

Pattern along a path is probably the way to go.

Maybe have a look at stacking stroke
http://v1nce.com/svg/demos/rails.svg (exemple with circuit and railroad path)
viewtopic.php?t=18774

but it's more a trick that something really usefull

Pattern along path distorts the sleepers. What if op wanted to draw the fastening too?
Or adding wood grain texture/gradients.

Using custom markers could make a better use then. Yet transformations could mess up the whole thing horribly if copy/pasted from one document to another. Or not render at all in browsers.