I assume that these travellers are people who need to go to work. People without whom the place would grind to a halt.
So why has Transport for London shut tube stations and reduced the number of trains?
What it means, of course, is that fewer drivers/guards are required, which saves them risking their health and I can appreciate and salute that.
But it also means that people (essential workers remember, many of them medical staff) are packed in like sardines into the small carriages and on the platforms, and any chance of 2 metres between people is laughable.