Points of interest is the track mounted digger using cables and pullies to slide the bucket up and down the jib. Ground excavation was carried out by first constructing a railway track on which the excavator stood and also the wagons of soil stood. When the ground is excavated from one area the tracks are moved along a bit. You can clearly see where the sleepers had been in the foreground. Two tipping carts are in the background with old fashioned cart wheels! Beyond is a covered Service Reservoir. Probably High Service and the construction of 3 filter beds and service reservoir sometime in the 30s?