Accepted answer

It's probably a style/css issue.

Try setting the fill to none on the path..

path {
    fill: none;
    stroke: black;
    stroke-linejoin: round;
    stroke-width: 1.0;

or something like that. You prob also want to add a class to the path so your css selector can be specific to the railroad path (not sure if that's what the "rail-line" class is for).

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