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i rememebr these well...a SR speciality and huge.....the SR often reused underframes.....even BR reused NOL underframes to build 2-HAP''s and /or 2 EPB's in the 50's
I'm not sure why they needed such vehicles given the lack of serious gradients and relatively low freight density but I wonder if it has to do with extra brake power being desired with the close signal spacings aroung London on the Southern
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