I agree, there isn't much between Seattle and Tacoma.
The main nodes are probably Kent and Auburn, which the current route serves almost perfectly.
The problem is, these two cities are not completely on the way to Tacoma, and so the Sounder has to meander slightly to reach them.
I think that a consistent theme for Seattle is that major business destinations are not always oriented in a straight line, which makes building an effective train system a little difficult.
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Pretend Seattleite.
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