High Speed Rail (HSR) is defined as trains running at 250+ kph on dedicated track or 200 kph on existing track. (https://en.wikipedia.org/wiki/High-speed_rail). Trains sets (traction units and coaches) are significantly more expensive for trains that can go 250 kph than for trains than only go 200 kph. High Speed Rail is normally used to replace air travel as long stretches of straight track are required to minimize the travel time.
High Performance Rail (HPR) is a mixture of local trains, regional express trains and fast trains. The approach is to fix the bottle necks in the system and provide fast, efficient, reliable and reasonably priced rail services to communities along the route. It in not designed to replace air travel but to replace car travel.
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Read All Aboard St Mary’s proposal