All costs are inflation adjusted for year 2021. Inflation data source is https://data.bls.gov/timeseries/CUUR0000SA0.

1. FTA database, light rail, heavy rail and commuter projects. 47 projects in total.

a. Colors show mode.

b. Colors show mode, and Chicago Brown Line Ravenswood is excluded.

2. ENO database, light rail, heavy rail and commuter projects. 69 projects in total. Costs are already inflation adjusted.

3. Costs of Projects without Tunnels
a. FTA: 20 projects.

b. ENO: 43 projects.