Posted by Jean-Marc Frybourg on November 12, 2017 
Wow! What a rare and interesting document Thanks a lot for sharing
Posted by Troy Staten on November 12, 2017 
Wonderful photo thanks for sharing it with us.
Posted by Curious142 on November 12, 2017 
March 23 or what year? Before the war (WWII)? Very interesting piece of machinery.
Posted by Jeff Sell on November 12, 2017 
She certainly is an interesting looking locomotive with equally interesting running gear!
Posted by David Garon on November 13, 2017 
Following some online research, I determined that the tests of BT11 were run on the Nord and the PLM in March-April 1937.
Posted by elektromotive on November 13, 2017 
The year should be 1937 as per very detailed history of this locos at this site:
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