Add punctuation to the following sentence: In that time weve progressed from steampowered locomotives to highspeed trains that travel beyond 300 kmh 175 mileshour But the principle remains the same trains need to be reliable and they need to be on time
In that time, we've progressed from steam-powered locomotives to high-speed trains that travel beyond 300 km/h (175 miles/hour). But the principle remains the same: trains need to be reliable and they need to be on time.