My New Mind Map

1. What I know

1.1. bad things about trains

1.1.1. Expensive compared to buses

1.1.2. Accidents on tracks

1.2. Features

1.2.1. eco-friendly

1.2.2. Fast

1.2.3. Fully air-conditioned

1.2.4. Convenient

1.3. MRT trains lines

1.3.1. NS

1.3.2. EW

1.3.3. CL

1.3.4. DT

1.3.5. NE