Looking WSW from just above JFK Bridge .
<p>I think much (possibly all) of this equipment is for the <a rel="nofollow" class="external text" href="http://www.steelconstruction.info/Surface_preparation">preparation of steel bridge surfaces</a> before repainting them. This would involve <a rel="nofollow" class="external text" href="https://www.osha.gov/Publications/OSHA3697.pdf">abrasive blasting</a> to remove rust and old paint, as well as the safe recovery and disposal of blasting dust and residue, since pre-1980 paint may contain toxic metals such as lead and <a rel="nofollow" class="external text" href="https://www.osha.gov/Publications/OSHA_FS-3649_Bridge_Painting.html">chromium(VI), or hexavalent chromium</a>.
The JFK Bridge, opened in late 1963, was completely repainted in 1977. The next repainting project was <a rel="nofollow" class="external text" href="http://www.bizjournals.com/louisville/stories/2007/08/06/daily40.html">started in 1999 and went through several contractors</a> and a <a rel="nofollow" class="external text" href="http://www.enquirer.com/editions/2002/03/30/loc_former_bridge.html">bribery scandal</a> before completion in late 2007.
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Ohio River mile 603.
Louisville, KY.
12/10/2000.
A0L013.
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</p>
old scan of 6x9 cm E-6 transparency
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70020260@N04">William Alden</a> from Louisville, Kentucky, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/33233529546/">a0l013: Painting equipment at JFK Bridge, Louisville</a>