More than 100,000 London-bound rail commuters - a fifth of the overall total - have to stand at the busiest times of the morning rush-hour, according to Government figures.
Passengers on some morning and evening peak services are travelling on trains which are 60% over capacity on certain routes, the Department for Transport (DfT) figures showed.
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Kent Police said they believe the driver had been asked to leave the club following an altercation.
Emergency services were called to South Street in Enfield this morning, but the victim was pronounced dead around 30 minutes later.
Scores of flights were cancelled and drivers were warned to take care as the "mini beast from the east" swept in.