https://en.wikipedia.org/wiki/Capital_MetroRail#History 3-22
http://www.statesman.com/news/news/local/challenges-remain-as-metrorail-finally-leaves-stat/nRrRG Monday, March 22, 2010
https://en.wikipedia.org/wiki/Capital_MetroRail#Operation
https://en.wikipedia.org/wiki/Capital_MetroRail#Future_expansions
points in time: pit