The rules have been dubbed a "political stunt" as unwell passengers board the tube at Heathrow unaware there's a quarantine.
The Government is facing criticism over its decision to legally require travellers to the UK to isolate for 14 days.
Almost a quarter of people said they had been in similar circumstances to Dominic Cummings but had chosen to stay put.
The company says it is already looking ahead to its second test.
Emergency services scrambled to save a man after he became stranded in Clevedon, Somerset, at 8pm on Friday (22/5) night.
"My husband walked the dog the other day and he stepped over three lots of human faeces with discarded underwear which they'd just left."
London North Eastern Railway will introduce the measure when services are ramped up next week.
Prime Minister Boris Johnson is expected to announce the move in an address to the nation on Sunday.
The woman, who did not wished not to be named, said she reacted with "shock, dismay and worry" as fellow passengers flouted procedures.
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