The final two stops are affected.
The transit authority wants a diverse group of tech-savvy riders for a six-month test of the prototype. "contactless" fare gates that use new technology.
Track fire prompted repairs to rail fasteners.
The test of new fare-collection technology will include 10 rails stations, six bus routes and two parking garages.
Better police strategies, more public awareness -- and frigid winter weather -- contributed to a sharp drop in crime in the Metro subway and bus systems.
Major Metro track work will affect several rail lines over the Labor Day weekend. Trains will operate on a weekend or adjusted schedule on Labor Day.
Trains were stopped at Fort Totten.
Some passengers on the Red and Orange lines will wait longer for trains this weekend.
Metrorail will operate into the early hours of Tuesday to accommodate FedEx crowds at Redskins' preseason game.
A train was disabled at Virginia Square.