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Hi SFE, Congratulations on your promotion.
If I remember correctly, brake tenders were introduced with the EE Type 3 (later class 37) because their introduction meant heavier trains could be run at higher speeds. Remember that most freight was carried in unbraked stock, only the locomotive and the guards brake van had brakes. The extra speed and weight required more braking power.
I clearly remember the brake tenders being used on the North Eastern main line North of York in the early 60's.
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