Of course there are some high speed services and some low speed ones, but the same is true of buses - look at National Express compared with town circular routes. The figures are an average. Buses do have a speed advantage on dedicated routes, but these remain quite few, especially on trunk roads for express travel - look at the furore created by the M4 buslane. It is also very difficult to fit two lanes of motorway width into the same space taken by two express rail lines, plus comfort has to be taken into account. I find travelling by rail far more comfortable than by coach or bus, and there is evidence to suggest that numbers travelling fall significantly when a rail route is closed and replaced by a bus service - it certainly happened after the Beeching cuts. Some of the smallest branch lines may do better with a bus service, I can think of two or three off the top of my head, but I doubt significantly whether the capacity would be increased or speed kept remotely the same were mainline services replaced by coaches. One also has to consider the environmental effects - trains are much more efficient than buses and produce a fraction/passenger of the pollutants. A large amount of freight is carried using the redundant capacity at night - freight that would have to return to the roads or HGV. The rail system needs investment for sure - I'd love to see an LGV (high speed line like the new channel tunnel link or the TGV lines in France) between London and Scotland with speeds around 200mph. It would revitalise the economy (look at the effects the TGV had in France), open up Liverpool as a major port for American-European freight and also help move a lot of traffic off our motorways, meaning car drivers had less congested roads. Rail commuter services into and out of London are already showing improvements with much improved new stock with improved speed. I travelled on the Southend line just the other week on a new train with air conditioning and immense amount of room, and the top speed on the line is 100mph which is attained at a number of places along the route.