I visited the Postal Museum and went for a ride on the Mail Rail tube train yesterday, Tuesday 19th September 2017.
I thought that what the Post Office has done was fantastic and give it 9.9 / 10. My only reason for not giving it 10 / 10 was the brevity of the train ride. A longer ride would have been even better!
The Postal Museum has two sites located at Mount Pleasant, which unfortunately is a London backwater in so far as despite its location it is remote from any railway services. Its about 15 minutes walk from Kings Cross St Pancras station.
One of the sites is about post and telephone, the other site is about Mail Rail.
Mostly the museum exhibits at the Mail Rail site are about the deep level tube line under London but the mainline postal service has not been forgotten. Visitors even have a chance to practise sorting 'letters' inside a swaying simulation of a former sorting carriage.
The highlight of my visit was the ride on a converted Mail Rail tube train. The journey passes through several stations where audio-visual film displays are shown on the platform walls. There is also a simulated power cut - where the train comes to a halt and for a few seconds everyone is in pitch black. Although the Post Office railway used a third rail power supply system these trains are battery powered.
Below are two images which I tweeted - at present I do not have any other images online.
One shows a train at the station and the other is a still image from moving video showing the view. The trains have clear glass (or perhaps similar material, such as Perspex) covers which are closed during the journey as these afford maximum visibility whilst also preventing passengers from touching the inside of the tunnels.