Replica of SR 99 tunnel boring machine on display


August 16, 2012 · 2:01 PM

The world’s largest-diameter tunnel boring machine will arrive in Seattle next year, but people can get an idea of how it works now.

A 10-foot-long, motorized replica of the machine is on display now at Milepost 31, an information center that highlights the people and projects that shaped Pioneer Square and provides an inside look at the SR 99 Tunnel Project.

About 35 times smaller than the real thing, the model offers an up-close look at the inner workings of the five-story machine that will dig the SR 99 tunnel. The push-button display allows visitors to control some of the model’s parts, demonstrating how the real machine will work as it bores up to 200 feet beneath downtown Seattle.

Milepost 31 is located at 211 First Ave. S. The display is open from 11 a.m. and 5 p.m. Tuesdays through Saturdays. Admission is free.

More information is available at www.milepost31.org.

Comment on this story.

COMMENTING RULES: We encourage an open exchange of ideas in our online community, but we ask you to follow our guidelines for respecting community standards. In a nutshell, don't say anything you wouldn't want your mother to read. Please see our FAQ if you have questions or concerns about using Facebook to comment.

So keep your comments:

  • Civil
  • Smart
  • On-topic
  • Free of profanity

We ask that all participants own their words by logging in with their Facebook account. It's a simple process that will take seconds and helps keep our comments free of trolls, cranks, and “drive-by” commenters. We reserve the right to remove comments from anyone using screen names, pseudonyms or false identities. Please refer to our Terms of Use for full detail on participating on our site.