The coal/aux switch is for when you have the Auxiliary Water Tender (20-3762). Placing the COAL – AUX switch in the AUX position will allow the commands for firing the rear coupler on the Auxiliary Tender and not the Main Tender. Likewise, the backup light on the Auxiliary Tender will replace the operation of the backup light on the Main Tender. You have a great looking engine there. I have the set plus the SP PA-1 and F-7 engines.
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