Rear view of the Southend trolleybus 123, JN4373, being tilt tested at the English Electric works in Preston. 123 was a unique vehicle, an AEC Q type trolleybus, one of only five built and the only one to receive a lowbridge body.
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Note that compared to other photos of Southend trolleys undergoing the tilt test, by 1934 EE had built a proper tilting platform.

Photo from English Electric collection courtesy David Beilby, taken 1934