The cache is placed between two lost bridges. The first was over Hangleton Road (at the top of this Twitten) and the second was a brick arch over West Way (at the bottom of the Twitten).
Hangleton Road was a mere lane when the railway tycoons came along and it was in a bit of a valley, which needed to be bridged and what better way to bridge a lane than to build a bridge? So that's what the moustachioed pioneers did.
You can see the Hangleton Rd bridge, on a bit of a floody day here:
The railway closed before the war, but the Hangleton Rd bridge was not dismantled until 1942, when they also thought it would be advantageous to fill the dip up to bridge level.
You can't see the Hangleton Rd bridge here, but you can just about see the West Way bridge, if you squint hard enough. There are embankments on either side (Taken from the Stapley Road/Hangelton Road corner):
Thanks to James Gray for collecting local photos and to the Regency Society for putting them online!
Onwards to the Dyke!
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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.