The Chattenden and Upnor Railway (later known as the Lodge Hill and Upnor Railway) was a narrow gauge railway serving the military barracks and depot at Upnor and associated munitions and training depots. It was built in 1873 as a gauge railway, converted to narrow gauge around 1885, and continued in use until 1961.
The Chattenden and Upnor railway stopped being in use exactly 40 years ago.
My statement is definitely incorrect because the Chattenden and Upnor railway stopped being in use in 1961, which is not exactly 40 years ago. It would've been exactly 58 years ago and I think it was too difficult for the model because it assumed that 1961 was exactly 40 years ago.