Our reporter Sangeeta Kandola went to meet Chris Brittain and Beau Brown in September last year - best friends, both have cerebral palsy.
Beau, from Weybridge, recently received an operation in American to help him walk. Chris meanwhile, from New Haw in Surrey, is still waiting for enough money to be raised to pay for a similar operation.
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"All it takes is for somebody to see me - and I could just die, just like that. I could want to go to the shop and not come home."
Before the killing, Peters searched the internet for "serial killers", "treatment of child killers in prison" and "premeditated murder".
Arriva Rail North, Greater Anglia and South Western Railway are all affected.