This image is from the AIGA symbol signs collection which was produced through a collaboration between AIGA and the U.S. Department of Transportation (DOT) in 1974 and 1979. All images in the collection are public domain .

Duplicate of Aiga_railtransportation_inv.gif

This W3C-unspecified vector image was created with Inkscape .

This image is from a collection commissioned by the United States Department of Transportation and designed by AIGA. It is copyright-free, and is available here .