But you need local train service to allow for the long distances between stops you want on high-speed steel-wheel on steel rail systems. And, while there are alternatives with significantly higher acceleration/deceleration performance, they are not quite practical or use a lot more energy (Maglev could allow for frequent (100km @ 1000km/h top speed) stops, but it's extremely expensive to set up and there is basically no way to evade obstacles). These medium-speed tracks are old, but they allow up to 160km/h regularly if converted to ETCS (I think they need Level 2, due to the increased breaking distance), that is, with the normal regional trains introduced in the past few years.