They never campaigned on it. They've both talked about it. They've talked about not starting it until 2018 when Transit City was completed. They are both aware that it's in Metrolinx's big move. And presumably Giambrone and Miller are both complicit in the current TTC study to look expanding rapid transit downtown ... the DTRES.
Thomson does indeed support it. She seems to have some pretty neo-con ideas though. I'm not sure I could ever vote for someone who wants to privatize the libraries, no matter how good their transit plan is. And she does have some issues in her transit plan; she proposed building not one, but two subways to Scarborough Centre ... that seems to be a gross mis-use of money.