AccScience Publishing / EER / Volume 1 / Issue 1 / DOI: 10.36922/eer.3470
ORIGINAL RESEARCH ARTICLE

Impacts of mode shift on well-to-wheel emissions from inter-capital transport in Australia – Part I: Road and rail transport

Robin Smit1,2* Paul Graeme Boulter3
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1 Transport Energy/Emission Research (TER), Launceston, Tasmania, Australia
2 Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, Australia
3 EMM Consulting, St. Leonards, New South Wales, Australia
Submitted: 23 April 2024 | Accepted: 27 June 2024 | Published: 26 July 2024
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
Abstract

Achieving mode shift in the transport sector will help Australia to meet its target for net-zero greenhouse gas emissions by 2050, although robust data on its effectiveness have previously been limited. This analysis provides valuable new information on mode shift impacts on emissions in Australia and demonstrates some recently developed assessment tools. The analysis considers the potential of a shift from road to rail to reduce well-to-wheel (WTW) emissions (as CO2-equivalents, CO2-e) in 2019, 2030, and 2050, specifically for a case study involving the transport of passengers and freight between Brisbane and Melbourne. The analysis provides emission intensities (EIs) in grams per passenger-km (g/pkm) and grams per tonne-km (g/tkm), as well as annualized emissions, and considers the variability and uncertainty in the estimates using a probabilistic approach. The transfer of passengers and freight from road to rail has the potential to significantly reduce emissions. Electric rail delivers the largest and least uncertain emission reductions. For passenger transport, the EI of electric rail (12 g CO2-e/pkm in 2030; 6.5 g CO2-e/pkm in 2050) is considerably lower than that of road transport (143.2 g CO2-e/pkm in 2030; 58.9 g CO2-e/pkm in 2050), and the uncertainty is lower. For freight transport, the EI of electric rail (8.6 g CO2-e/tkm in 2030; 5.0 CO2-e/tkm in 2050) is also substantially lower than that for road transport (48.3 g CO2-e/tkm in 2030; 29.5 g CO2-e/tkm in 2050). The EI for diesel rail freight (27.0 g CO2-e/tkm in 2030; 26.1 g CO2-e/tkm in 2050) is around half of the value for road transport in 2030, but road transport becomes more competitive by 2050. The complete transfer of passengers between Brisbane and Melbourne from road to electric rail would reduce annual WTW emissions for passenger transport by 75 – 90%, depending on the year. The complete transfer of freight from road to diesel rail would reduce annual emissions by 45% in 2019 and 2030 and by 10% in 2050. The study and tools will help researchers, policymakers, transport/land-use planners, and network operators to quantify, design, and implement mode shift measures to reduce emissions.

Keywords
Emissions
Mode
Shift
Passenger
Freight
Road
Rail
Well-to-wheel
Funding
None.
Conflict of interest
The authors declare that they have no competing interests.
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