Not done. That's only, what, 240 miles? Which means it's not exactly high speed, is it? It could probably reach the 25k/hr that my sibling commentor is asking

Not done. That's only, what, 240 miles? Which means it's not exactly high speed, is it? It could probably reach the 25k/hr that my sibling commentor is asking for, but not the 100k claimed for HSR. Additionally, if it's Southend-on-Sea, that's not a major urban area. At 25k/hr, you could move the entire population to Liverpool in a little over 7 hours. I smell a contrivance. Lastly, the name of that picture describes the train carriage as "busy" not something like "typical", so even then I'm skeptical. Try again. London to Edinburgh. High speed. Typical rush hour.