You're standing near to a ghost bridge, which the trains used to pass under, as they made their way through a deep cutting, round the back of Poplar Avenue.
The railway closed on the New Year's eve 1938, but with the upcoming war filling in the cutting was not a priority and this was not done until March 1945, using concrete tank traps, from the seafront, which were no longer needed, as we had all but won at that point.
The filled-in cutting is now part of Hangleton Primary School's playing fields.
The bridge was more resilient and survived another 4 years.
In case you didn't know what the beach looked like during the war:
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Doing the series by bus:
The bus is recommended (ironic), as this isn't a circular series.
To start at CC1 get a 5 or 5A, get off in Old Shoreham Rd at the Aldrington Road stop and walk down to the station. To start at CC7 get a 5B and get off at the Dyke trail start. The Dyke bus is the 77 (catch at the hotel), which is sometimes open-top, but at certain times of the year-autumn/winter this service only runs at the weekend.
Cars:
There are various car parks and roads along the route, especially at CC7. You may want to do sections and then go back to your car, drive to another car park and do the next section.