From the holdings of the Seattle City Archives, Washington, USA. Plates 12 and 17 of a map charting use of streets throughout the city. This covers the north end of the line, from Spokane Street to Roxbury, which is still the city line.
There is an obvious correspondence between development and location of the line. Interestingly, growth seems to have been more likely to occur between stations along the line than along streets perpendicular to the line.