Cyclist safety is one of the mayor's highest priorities, the Boris Johnson's cycling commissioner said.
Andrew Gilligan said:
Our thoughts are with the family and friends of the cyclist who died today.
We are spending almost £1 billion to make London's roads safer for cyclists. We are designing segregated cycleways, rebuilding the most dangerous junctions, and talking to the Government about fitting all lorries with safety equipment.
This work cannot be done instantly - indeed, it would be counterproductive to do so. But it is being done quickly. It is one of the mayor's highest priorities.
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A number of families were on board the service from London Euston to Stoke. One family left the train early to escape the abuse.
She's called Amy, and was visiting a hospital.
The victim is believed to be aged in his 60s and though next of kin have been informed, formal identification has not yet taken place.