This is about as far removed from the S&D as possible. But I love this shot. It shows the railway that used to link Farnborough station in Hampshire with the RAE about a mile away. Much of the route ran through the streets. The line closed in 1967 or 1968. I remember reading an article on this route in an ancient Railway Magazine but there were no pictures. This is the first picture I've ever seen of the line and it's an absolute gem!
I'm very familar with street running from my many visits to Switzerland, and there are still many miles of street running in Switzerland with long and regular passenger trains.
Street running is likely to make a big comeback in the UK as rail expands, We've already seen the first small stretch at Porthmadog on the Welsh Highland Railway, and it has been suggested as a cheaper way of reconnecting Wadebridge with Padstow. Tramways are likely to spring up in all medium sized towns and cities, many which will have an element of freight transport as well. It's also likely to be used to connect factories and other industrial locations to the network without a passenger element - it is far cheaper than using a dedicated route. As the roads empty it will become a commonplace sight. It may even be used on parts of the S&D, who knows?