This study aims to analyse the inter-rail modal shift behaviour of suburban rail passengers to examine ridership for the proposed metro extension corridor in Chennai, India. This investigation was conducted in 2019 as part of a feasibility study for the extension of the metro line spanning between Chennai Airport and Kilambakkam, a southern suburb of Chennai. The same origin–destination pair is also served by the suburban rail system. It is an extension of the operating line from Washermenpet to the airport of the Phase I metro project. For this inter-rail competition study, a sample of 272 suburban rail passengers covering work, education and other trip purposes were interviewed using a stated preference questionnaire. Six stated scenarios were considered for analyses which included travel time saving by using the metro along with the fare difference between metro and bus. The study revealed that suburban rail passengers were less concerned about travel time saving and gave priority to fare difference irrespective of trip purpose. This shows the unique metro choice behaviour of suburban rail travellers in the Indian context.

本研究旨在分析郊区铁路乘客的铁路间交通方式转换行为，以检查印度金奈拟建地铁延伸走廊的客流量。这项调查于 2019 年进行，是金奈机场和金奈南郊 Kilambakkam 之间地铁线路延伸可行性研究的一部分。郊区铁路系统也为同一起点-目的地对提供服务。是地铁一期工程Washermenpet至机场运营线的延伸。在这项铁路间竞争研究中，我们使用规定的偏好调查问卷对 272 名郊区铁路乘客进行了访谈，涵盖工作、教育和其他出行目的。分析考虑了六种情景，其中包括使用地铁节省的出行时间以及地铁和公交车之间的票价差异。研究显示，郊区铁路乘客不太关心节省出行时间，无论出行目的如何，都优先考虑票价差额。这显示了印度背景下郊区铁路旅客独特的地铁选择行为。