Even if Oregon's congressional delegation and Governor are successful in halting oil trains on the Oregon side of the Gorge, what about the Washington side of the Gorge along Hwy. 14?  
To my eyes, the oil trains that travel those tracks are typically longer and carry far more crude than on the Oregon side.
The issue of rail transport of Bakken crude can no longer remain a state-level issue.  There have been 10+ derailments resulting in spills/fires in other states over the past 3 years and one has to wonder how/why Oregon's incident might change anything.  Why is this?
A major problem is that Berkshire-Hathaway owns both Union Pacific and BNSF and has established a duopoly on commercial rail traffic in the continental US.  They are a major force to be reckoned with and to think that either the Obama administration or today's Congress will act to protect towns, natural resources or people along their tracks seems a bit wishful if not naive.
I wish I felt differently.