Because all the engines on the CB&PR line were steam engines, they regularly needed to take on water. While the train would be stopped at the Passage West station, the boiler of the engine would be filled with water from this fine limestone water tower. At the same time, the coal cars were reloaded.
The stile in the limestone wall to the left of water tower was that over which passengers would climb when going to or coming from the station. In 19th century, the main road in the town, known as the Copse, was directly opposite the stile. At that time, passengers alighting from a train would get to Passage town centre by climbing over the stile, walking up the Copse,along Fair Hill and Church Hill. In more recent years, the Copse has become overgrown and is no longer used as a throughway.
The coordinates for the final cache are not the ones published. But if you look at both pictures below, from a distance of 30-40cm - will see the coordinates to the cache location.