Abstract
This paper explores the relative influence of factors affecting light rail ridership on 57 light rail routes in Australia, Europe and North America through an empirical examination of route level data. Previous research suggests a wide range of possible ridership drivers but is mixed in clarifying major influences. A multiple-regression analysis of route level ridership (boardings per route km) and catchment residential and employment density, car ownership, service level, speed, stop spacing, share of accessible stops, share of segregated right of away and integrated fares was undertaken. This established a statistically significant model (99% level, R2 = 0.76) with five significant variables including service level, routes being in Europe, speed, integrated ticketing and employment density. In general these findings support selected results from previous research. A secondary analysis of service effectiveness measures (boardings/vehicle km, i.e. the relative ridership performance for a given level of service), established a statistically significant model (99% level, R2 = 0.67) with 6 significant explanatory variables including being in Europe, speed, employment density, integrated ticketing, track segregation and service level. The latter implies that a higher frequency results in higher service effectiveness. Overall the research findings stress the importance of providing a high level of service as a major driver of light rail ridership. The ‘European Factor’ is also an important though intriguing influence but its cause remains unclear and requires further research to elaborate its nature.

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Notes
A log transformation of Boardings/Route Km (and, later, boardings/vehicle km) resulted in a lower R2 so the untransformed variable was used.
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Acknowledgments
Parts of this research was conducted while Dr. Ahern was on sabbatical at the Institute of Transport Studies, Monash University. The authors would like to thank the Urban Institute in University College Dublin for part-funding this sabbatical. The authors would also like to acknowledge the help of Susanna Schmidt of the Urban Institute Dublin for help with processing data. In addition Karen Woo of the University of Toronto assisted collecting some of the North American data whilst on a visit to Monash from the University of Toronto. We would also like to thank Prof Patrick Bonnel Professor of Transport Economics, ENTPE France for advice on sources for collecting data from France.
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Currie, G., Ahern, A. & Delbosc, A. Exploring the drivers of light rail ridership: an empirical route level analysis of selected Australian, North American and European systems. Transportation 38, 545–560 (2011). https://doi.org/10.1007/s11116-010-9314-9
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DOI: https://doi.org/10.1007/s11116-010-9314-9

