The solid rail lines are built and in service today, the dotted lines are under construction by Dart.
The Red and Blue light rail lines total approximately 45 miles, the TRE commuter line to Fort Worth is 34 miles.
The Green and Orange light rail lines total approximately 40 miles, once completed there will be over 90 miles of light rail.
The following map shows what's being planned for the Metroplex, an additional 250+ miles of rail.
The Black lines are built or have funding in place to be built soon, but may not be under construction yet.
The Blue line (ex-Cotton Belt corridor) is under official development (environmental studies) today. Funding for construction the Cotton Belt hasn't been completely identified. Dart and the T are hoping to accelerate construction of this line using public-private partnership schemes.
The Red lines are future plans that don't have funding in place nor official studies underway. For the Red lines to get built soon, passage of the Local Option Tax bill by the Texas Legislature will be required.