Tony Burgess states the justification for the tilting train rather well - increased speed, with safety and comfort. It is indeed exactly what the railway industry is trying to achieve for its passengers by introducing tilting trains.
I assume he would agree with the designers of the Brooklands race circuit that banking plays an important part in achieving high speed safety.
Road and rail are no different in terms of basic physics, but the steep camber at Brooklands was designed for racing at consistently high speeds.
Such extreme camber (cant) on a railway would not suit the slower trains operating on a mixed use railway, but adding tilt to higher speed passenger trains can offer real journey time benefits.
While they might be seen a compromise and do subject track to higher forces, tilting trains improve the competitive edge of the rail industry against road and air, both less environmentally friendly. Why knock the rail industry for that?
Tim Hall, 7 Savoy Court, Strand, London WC2R 0JP