Comment by prmph

7 hours ago

Both are high-speed trains regardless of whether they are in motion or not.

High-speed is a descriptor of the type of train, not their current speed.

Just like a racing cars is still such even when stationary.

"racing cars" actually would not be stationary. "Race cars" are the class of vehicle, which can be stationary. If the cars are racing, they are not stationary.

"High-speed" is ambiguous. It can be used to describe the class of vehicle, or it can be used to describe the state of motion of the vehicle.