I thought this was relevant:
http://www.kiro7.com/news/local/should-driverless-trains-be-in-our-future/490426182
Quote:
Transit expert Jarrett Walker said driverless systems are expensive to build, but transit agencies can save on labor expenses.
“Most of the cost of running transit service is the cost of labor so if you carry more people per driver you have more abundant service," Walker said.
...
In August 2016, KIRO 7 asked Sound Transit's Rogoff about driverless trains in ST3.
He said it isn't something the agency would look at right away.
But he also said: "Let's remember that we're talking about a 25-year plan and this is something we can and probably will look at in the future."
In a new interview this week, Rogoff told KIRO 7 the agency's thinking has evolved.
"The more we looked into this it's very hard to imagine that we'll ever have driverless trains on the Sound Transit network," Rogoff said.
Rogoff said Sound Transit has money to expand service but not to retrofit with expensive automation.
And he doesn't want driverless trains on only one part of the system.
"We want our trains to be interoperable, we want every train to be able to run on every segment of the rail network," Rogoff said.
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Note the importance of the bolded. Seattle likely will not run any automated trains because they need them to be able to run on all the network. Now consider the fact that you can use the automated technology and still run them manually if needed. Seattle doesn't need to run our vehicles, and they don't need to retrofit their existing trains with it, they would just buy new new trains that support the automated control, and run the rest of the network in ATP or STO (GoA 2) mode, and just don't run the old trains on the automated section. (San Francisco's MuniMetro runs automated in the grade-separated segments as an example of using both modes simultaneously.)
In regards to Surrey, it's the same thing, by Surrey running yet another incompatible rail system, it increases the costs of the entire Translink rail system.