Railroad indicates the direction the strips are running.

If the stripes run across the width of the fabric...

It is railroad!

RAILROAD FABRICS

"Railroad" means the design of the pattern runs vertically across the roll from selvage to selvage. When viewing the material from the selvage edge, any figures will appear upright. Railroad stripes run across the roll. For this reason railroaded fabrics are not recommended for use in making draperies.
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