Second out is an FP7, which was a bit unusual.
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What is the purpose of the cylinders on top of #6903?
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The air brake reservoirs were probably relocated to the roof to install a larger fuel tank. E-units were renown for their ability to drink fuel.
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Actually the air tanks were moved to the roof for additional boiler water capacity for the steam generators. They could go there a lot of water for that. The oval tanks in front of and behind the combined fuel/water tank replaced the standard air tank location for the boiler water.
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