This picture from Paul Bateson shows Southend PD3 337, CJN437C, operating the first service journey under the High Street railway bridge on route 29 on Sunday September 26th, 1965. The roadway under the bridge was lowered so that the PD3s would fit, and judging by the queue of traffic behind 337, the driver wasn't taking any chances.
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Photo taken by Paul A. Bateson, Sunday 26 September 1965, Southend High Street