in what cities in oregon can you still view the oregon / overland trail tracks?

Answer 1

Outside Baker City in eastern Oregon. But there are a lot of other spots along the route from Oregon City to the border in Idaho that have a lot of history to explore.

"The National Historic Oregon Trail Interpretive Center
is located 5 miles East of Baker City on Oregon Highway 86"

"The National Historic Oregon Trail Interpretive Center, managed by the BLM, is open daily with a complete recreation of life along the Trail. From powerful interactive exhibits to century-old ruts you'll re-live history. For a spectacular side trip, take the Hells Canyon Scenic Byway for a view of the world's deepest river gorge."

For a good, short summary of what's available to see and do, check out this site: http://gorp.away.com/gorp/activity/byway/or_orego.htm