(Loss-adjusted conversion factors)
|Revenue passenger-miles (millions)a||3,753||4,503||4,785||6,057||6,273||6,091||6,199||5,869||5,401||5,066||5,166||5,325||5,289||5,574||5,571||5,314||5,680||5,511||5,381||5,410||5,784||6,179|
|Total fuel consumed (billion Btu)a,b||U||U||U||U||U||U||U||13,409||13,530||13,651||14,545||14,872||15,591||18,061||18,171||17,101||15,934||15,242||14,607||14,371||14,584||14,850|
|Electric (millions of kWh)a,b||U||U||U||U||U||U||U||309||336||363||390||416||443||470||456||518||537||551||531||549||578||582|
|Diesel (million gallons)||U||U||U||U||U||U||U||74||72||71||76||76||79||95||97||84||75||69||65||62||62||63|
|Energy intensity (Btu/revenue passenger-mile)a,b||3,548||3,065||2,703||2,505||2,417||2,534||2,565||2,282||2,501||2,690||2,811||2,788||2,943||3,235||3,257||3,212||2,800||2,760||2,709||2,650||2,516||2,398|
KEY: Btu = British thermal unit; kWh = kilowatt hour; R = revised; U = data are unavailable.
a Energy use for 1994 on is not directly comparable to earlier years. Some commuter rail energy use may have been inadvertently included in earlier years.
b Includes electric power generation and distribution losses.
Energy intensity (Btu/revenue passenger-mile) is calculated by the source and may differ from direct calculations.
The heat equivalent factors used in Btu conversion are:
Diesel = 138,700 Btu/gallon.
Electric = 10,399 Btu/kWh. The electric conversion factor takes into account losses associated with the generation, transmission and distribution of electricity, and thus it is more than three times the value of the factor that is used in table 4-26a.
U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy and Oak Ridge National Laboratory Center for Transportation Analysis, Transportation Energy Databook, Edition 28 (Oak Ridge, TN: 2010), tables A.15, 9.10 and similar tables in earlier editions, available at http://www.cta.ornl.gov/data as of Dec. 28, 2010.