locked Southern B36-7


Here's some questions for the motive power gurus. 
I have just received my Rapido B36-7's. Rapido chose to model numbers 3816, 3818, and 3819. All three have the white number boards with black numerals indicating the units were equipped as Locotrol masters. Also have the extra antennas. 
From the limited photos I have located in books and online this appears to be correct. So did all 6 B36-7's come from GE with Locotrol installed?
It also appears that the Locotrol equipment was removed after a short time, evidenced by the black number boards with white numerals in later photographs. When was the Locotrol equipment removed from these units?

Walt Rieger
Covington, LA

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