This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
blackandwhite cartoon text black and white These section drawings illustrate the Foot HSTs configuration after the installation of the slotted wall test section. Unlike the original tunnel the new test section was fabricated of steel. These section drawings illustrate the Foot HSTs configuration after the installation of the slotted