> The point was capacity through frequency. Mm, the point was increasing capacity on the WCML, for which there is large demand right now What's murkier is wha

> The point was capacity through frequency. Mm, the point was increasing capacity on the WCML, for which there is large demand right now What's murkier is what capacity is needed 50+ years from now on the new line. It was never going to be full day 1, but you don't build new expensive things hoping to run them at 100% capacity from the very start. Passenger growth was (pre-covid) only going up, so a design that could cope with passenger flows for the next 50 years was inevitable.