Earlier quoted context omitted.
I was discussing railways to somebody and noting how at-capacity the British network is. He was adamant that we just hadn't optimised the system enough and that more maths and more software was needed. I tried my best to explain that we had in fact done that, and that in the end, there's no getting around the bottleneck of moving 100 tonne vehicles along a finite set of steel rails.
You could apply clever modelling to work out what minimal set of upgrades would best increase capacity .. and then spend the next 30 years trying to get one line built. We're stuck at basic political questions like "should there be efficient trains between London and Manchester?" At least Burnham knows what a Manchester is.
And preferably at prices lower than what an equivalent journey would cost by airplane.