50,000 cubic yards of Earth was removed from under Beacon Hill for each of the two Beacon Hill tunnels. A similar amount of Earth was removed for the Beacon Hill station. That subway section is one mile long, so you could imagine how much soil will be removed from underneath Seattle for the 6+ mile subway from (almost) Westlake to (almost) Northgate.
Here are a couple more 50s. Forward Thrust got 50.8% of the vote in 1968, but 60% was needed to pass. 1950 was the year of the last Kirkland-Madison Park Car Ferry ran. The last passenger-only ferry on that run was a year later and thus ended all ferry service on Lake Washington.
One more random thought: is model train collecting much more popular than I know? I don’t collect them myself (I did collect guitars for a while, but Tamami has made me get rid of many of them), but it’s hugely surprising to me that the Mariners are giving away 20,000 model train cars as a gameday promotion.