Next to prohibit ticket terminals and a closed WH Smith, Boots and Paperchase, tables and chairs are decorated with cherry-red poinsettias.
One of today’s clients, Sharon, says she has worn her excellent dress for the occasion.
“My support worker Christine told me about this a couple of weeks ago, ” she says.
“I knew I didn’t have anything to do. I would be at home on my own and at times you’re lonely, especially at Christmas.”
Sharon, who moved to London from the US two decades ago, says she had to give up work as a retail director because of a leg injury, but hopes to return next year.
“I’m on the mend, I’ll surely be dancing today! “
About 120,000 people pass through Euston every day, building it Britain’s fifth-busiest study depot, according to ticket marketings data .
But today is more tightened; heartens start as a pianist plays Rudolph the Red Snout Reindeer.
It’s a novelty for those who normally work at Euston, including depot director Joe Hendry.
“I initially didn’t think it is a possibility, ” he says.
“But turning up to work today at 06:30 this morning and construing everyone here – it’s wonderful.
“We have a big neighbourhood homeless population here, so I’ve assured some familiar faces.”
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‘Lonely at Christmas’
Jay, initially from Cork, moves from place to place in the field, and is currently living in an abandoned solicitors’ bureau.
“If I wasn’t here I’d be in the power – there’s 20 of us – we would try and have a good time, ” he says.
“We get tickets for today – it’s nice to have something to do, we have bare cooking facilities and don’t have much money for nice food.”
But word has spread.
Outside the depot, people – numerous clutching blankets and shopping bags – are trying to get entry to the dinner, which is ticket-only and tightly guarded by Euston’s security staff.