I could really use a custom line style (my own "novel" design, if you like), but my experiments to date have not been successful.

I am drawing maps, and want to represent railways with a solid black line, crossed at frequent intervals by short lines, like this (if it works...): Click image for larger version. 

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I can pre-build a series of components with fixed widths and curvatures, but it would be so much easier if I could just draw a line, and have all the "sleepers" appear, normal to the central line drawn.

Can anyone advise?