Electric Multiple Units, like their Diesel Multiple Units counterparts, are trains with no locomotive and localised (one or more motorised carriages pull one or more non-motorised carriages) or distributed (all carriages have motors), all controlled from a driving position at either end of the train.

I did my initial trainspotting on the Oxted line. Bloody Fairburn 2-6-4T's but their exhaust could blow your ears off.

[Rosie] I think we all need some proof of this aural sectioning that you experienced...

(Bis) The interior of Riddlesdown Tunnel is littered with severed, now largely decomposed, auditory appendages. They are, or were, mine.