Below is a link to the Metrolinx Regional Express Rail (RER) business case:

http://www.metrolinx.com/en/regionalplanning/projectevaluation/benefitscases/GO_RER_Initial_Business_Case_EN.pdf
Please also see the link to the Globe and Mail article on this report, here:

http://www.theglobeandmail.com/news/toronto/provincial-service-expansion-plan-could-be-boon-for-go-transit-report/article29427820/