What is considered the MOST important element of good rapid transit service today?

The ability to keep trains on schedule is paramount in urban rapid transit systems for various reasons. Punctuality directly impacts riders' trust and satisfaction with the transit service, as most passengers rely on these systems to be timely for their daily commutes, appointments, or connections to other transit modes. When trains run on time, it instills confidence in the service, encouraging more people to utilize public transportation instead of personal vehicles, ultimately contributing to reduced traffic congestion and better air quality.

In addition, a reliable schedule enhances overall efficiency within the transit system. It allows for better planning and resource allocation, which can improve the frequency and availability of trains. While other factors, such as passenger comfort and employee training, are important for a well-rounded transit experience, they do not surpass the fundamental requirement for trains to adhere to their schedules. Frequency of service, while crucial, is often a result of a well-maintained schedule; if trains cannot stay on time, increasing frequency alone may not solve the issues faced by riders. Therefore, adherence to schedule is a critical foundation upon which all other aspects of a successful transit system are built.