Local authorities and transport companies should face fines if they fail to provide adequate care for stranded passengers, the head of the Commons transport committee has said.
Louise Ellman told Daybreak adverse weather conditions "can be predicted" and it was "the responsibility" of the authorities to "make provision" during disruption.
"Passengers want to know what it is happening. People are reasonable and they do realise where there is bad weather, there will be disruption.
"But they do need to know what is happening and know when that disruption is likely to end."
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The Metropolitan Police Federation, which set up the official JustGiving site, said it felt a "suitable amount" had been collected.
There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."