I'm following the instructions of a tutorial [link below] where you place a line over another line. That's simple, I've no problem with that. I didn't clone one of the lines, but duplicated it, if that matters.

The problem I have is that the tutorial has an example of exactly what I need, but I cannot replicate it using the settings (s)he has.

It should look like the railroad tracks at the very bottom of this page: http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Attributes-Stroke.html under Complex Strokes.

The instructions are:

Railroad tracks: consists of a 7 pixel-wide dashed path, with dash pattern (1.75, 1.75) over a 2 pixel-wide solid path.

Yet mine looks like the attached instead. What am I doing wrong?

Notes:

1. I did notice the comma between the 1.75's but whether I add that or not, nothing changes.
2. I understand that this is for an older version, but it appears to me that this shouldn't matter since it's still a Stroke Style.

I think they made a typo there... 0.3 1 are good values for railroad sleepers imo.

Agree... typo. Probably meant 0.175px

Excellent! Thank you so much @bleke and @TylerDurden! That did the trick. Love it!