**GEEK ALERT** Conceived by Oliver Bulleid for the Southern Railway's Dartford commuter route, the two 4DD electric multiple units were the only double-deck trains to run on the main line railway network in Britain. The upper-level seats were squeezed in between the lower-level seats to ensure that the overall height of the unit was within the clearances necessary to pass through tunnels and under bridges. The 4DD was somewhat unsuccessful because the upper level compartments were cramped and poorly ventilated (the upper level windows could not be opened). As an "experiment" they lasted in traffic from 1949 to 1971 undergoing routine maintenance and repaints with a no hiccups in their life.
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