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It is many years ago when I worked on the Southern Region. As far as I can recall all emu units were bus lined thoughout the unit, with a pick up shoe at the either side at the ends of each unit. When working with more than one unit they oftern gerked badly when they were gapped as one unit was sometimes gapped whilst the othere still had power. I think that some 2 car inits such as the HAL's were Power Bus Lined between units. Also was the 5 BEL Units and 6 CORs on the Brighton line Maybe someone with a better memory can advise me.
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