In, about, 1968 voters were asked if they wanted to pay for a Seattle
underground subway.  It was voted down.  What can you tell me about
that proposal?

Hello lumps-ga,

The proposal was promoted by an organization called Forward Thrust. 
It was actually a plan for a transit system that would have included
rail rapid transit and bus routes.  In February 1968, a majority of
voters in King County voted in favor of each of the pieces of the
proposal; however, since some of the components did not receive the
necessary 60 percent of the vote, the plan was defeated.  A revised
proposal was defeated in May 1970.

A detailed history of the Forward Thrust proposals is available here:

"Assessment of Community Planning for Mass Transit: Volume 9—Seattle
Case
Study", by Office of Technology Assessment, United States Congress
(February 1976) [see especially pages 16-23 of the document, which
correspond to pages 21-28 of the PDF file]
Woodrow Wilson School of Public and International Affairs
Princeton University
http://www.wws.princeton.edu/cgi-bin/byteserv.prl/~ota/disk3/1976/7610/7610.PDF

I hope that this information is helpful.

- justaskscott-ga


Search terms used on Google:

seattle subway voters 1968

[I tried other searches as well, but this search resulted in the
document I have cited.  For more information on the proposal, you
could search for: seattle "forward thrust".]