Train operations – Community of Metros Benchmarking Group

Introducing new fleets is a major, transformative project for metro operators, so managing these projects and mitigating their impact on existing operations has been of interest to COMET members. The study proposer, Newcastle Nexus, has been replacing its entire fleet in recent years and thus is keen to discover metros’ experiences in this area to deploy best practices and minimise impacts.

Based on responses from 32 metros, the study explored key tasks, typical time periods, common issues, and implemented solutions during different stages of fleet introduction phase, starting from pre-commissioning stage to final acceptance. Examples of best practices for each stage were presented, along with a summary of metros’ recommendations for future fleet introductions with a focus on project planning, risk management, and quality control.

There are multiple reasons why metros are particularly affected by human failures, including operations and/or maintenance occurring 24-hours a day, human judgement involved in multiple safety critical situations, and the potential for unpredictable overtime. Across COMET metros, human failure caused the majority of collisions and derailments. Miscommunications and multi-tasking are considered the top two most influential factors on human failures.

The study focused on active human failures that directly lead to incidents. Active failures are categorised into errors and violations, which can be further sub-categorised by the underlying motive, intention, and/or frequency. Understanding active failure types supports greater understanding of the root causes of failure.

Figure to show categorises of active failure consisting of error and violation

The study reviewed strategies for preventing human failure including process, environment, and people-based solutions. One example for preventing human error is assessing fitness for duty among train drivers. Half of metros reported use of a checklist or declaration, with some metros use technology to address fatigue including monitoring attentiveness and encouraging sufficient rest for employees before their shift. While many of these measures are focused on train drivers, increasing automation within metros means that such measures are becoming just as important for OCC staff. Opportunity areas for metros to reduce operational risk of human failures are discussed, supported by good practices and future initiatives conducted by COMET metros.

Research: Operational Impacts of New Fleets

Research: COMET Preventing Human Failures in Train Operations and the OCC