Here's another harbinger: air traffic between cities that are linked by high speed train lines is significantly reduced. This was a notorious effect of the Paris-Lyon route (Europe's first high speed train link), and has been seen more recently in the Paris-London, Paris-Brussels and Paris-Amsterdam combinations. In the country where high speed trains are growing the fastest is seeing the effects as well: The Madrid-Barcelona high speed link in Spain (AVE), which started operating in March, has
High Speed Trains
I must admit I'm a great fan of high-speed trains: they're very comfortable, they're fast and they take and leave you in the center of the city of your choice (usually). Japanese bullet trains and European TGVs, ICEs and AVEs have returned dignity back to railway transport. But not everybody is happy about them.