The real issue is lack of investment. The old lines with tiny trains not tall enough to stand in other than in the middle should have be rebuilt (much) larger l

The real issue is lack of investment. The old lines with tiny trains not tall enough to stand in other than in the middle should have be rebuilt (much) larger long ago with enough space for AC and modern amenities, but the British never bothered because "it's fine, London is not that hot anyway."