EPA Train Methodology — Now Live

What: Train emissions via the US EPA GHG Emission Factors Hub. Factors in gCO₂e/pax‑km (CO₂, CH₄, N₂O). If methodology_version is omitted, latest supported year is used.

Supported train_type: intercity_northeast_corridor, intercity_other_routes, intercity_national_average (default), commuter_rail, transit_rail.

Do now: Use US‑EPA for U.S. rail; add "methodology_version" if you need fixed‑year reproducibility.

Source: US EPA — GHG Emission Factors Hub.