The reason we're taking the train to Portland is because we want to explore the Columbia River Gorge area. We're booked in at the BW in Troutdale for a few nights. We're then driving up to the Olympic Penninsula for 3 nights before spending a night in Seattle & taking the train back to Chicago.

We've been to Seattle on the train before & fancied trying it another way.
We managed to drive up to Johnson Ridge on our last trip in excellent weather so are not fussed about doing Mount St. Helens this time.

Is there a site where I can compare rental prices in the Portland area?