Looks to me like Roger Puta was driving down the Tri State Tollway one clear (not the typical Chicago gray) winter day with puffy scattered clouds and decided to get off and see what the SOO had to offer as photograph subjects. 501-A was an FP7 and the wood car was B&amp;B cook and bunk car.  B&amp;B stands for Bridges and Buildings.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/129679309@N05">Marty Bernard</a> from U.S.A.
2017-04-03 22:25
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/129679309@N05/32986149044/">5 Random SOO Line Photos</a>