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Semi-HSR is a concept borrowed from SBB (SwissRail).
They plan to mix High speed (160 kph) speciality freight trains mixed with 200 & 240 kph pax trains. The "extra kph" to true HSR is not worth the cost of losing freight in the US.
Much time sensitive freight (fish, perishable veggies, JIT inventory, electronics, etc.) could be shifted from truck and air to rail and this could save as much oil as pax service.
At night, a different mix of medium density, non-stream lined cargo (containers et al) could operate at 90-110 kph with the streamlined 160 kph freight trains.
For the metrically challenged.
200 kph = 123 mph
160 kph = 100 mph
100 kph = 62 mph
NOT TGV, but faster than driving. And more energy efficient.
Best Hopes,
Alan
This is a concept that I have developed over time.
I suppose this semi-HSR has been developed in Switzerland because of the impossibility to reach the real high speeds in such a small territory (not flat furthermore).
I agree however with you that this use of the infrastructure is the most rational, esp. taking account the fact that it doesn't cost too much to refit the old lines to bear higher speeds.
The new Gotthard tunnel is flat (0.25 % maximum grade from memory) and almost straight for 56 km ! With 20 km and shorter tunnels as well; it will be a flat, almost straight run from Zurich to Milan when finished :-)
Best Hopes for SBB,
Alan
The prosperity of Switzerland started with the collecting of the taxes for the crossing of the alps, so we can say that this way is very important for us..