Great Northern Tunnel in Seattle

 https://en.wikipedia.org/wiki/Great_Northern_Tunnel Unlike in Vancouver, BC, Seattle made sure that this is a double track, freight & passenger train tunnel.

https://www.youtube.com/watch?v=xsiPzr_zKO8

https://www.youtube.com/watch?v=7GcpG0naFLY

https://www.youtube.com/watch?v=wuhyRY84xfU