NIR Posted February 26, 2021 Posted February 26, 2021 (edited) What was the purpose of the channel left along the ballast in the top photo. What was it called and when did the practice stop. Edited February 26, 2021 by NIR Quote
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NIR
What was the purpose of the channel left along the ballast in the top photo. What was it called and when did the practice stop.
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