Welcome to Aldrington Halt!
Here you are at Aldrington Station, which used to be called Aldrington Halt, after it was called Dyke Junction (this is where the Devil's Dyke train broke away from the Brighton to Shoreham line, heading north). The station was opened in 1905.
The tunnel under the railway lines was originally built to allow the local farmer to move his cattle between fields which became separated with the arrival of the railway.
PARKING & public transportation: You can't park in Old Shoreham Road, but the roads to the north of the station are still as far as I know free, but south of the station you would need to pay. If in doubt, be quick! There are plenty of buses in Portland Road and Old Shoreham Road and of course trains! Aldrington is not a main station, so don't expect more than 2/3 trains an hour in either direction.