Transit agencies are under pressure to keep service moving with assets that are increasingly complex, more heavily used, and often older than anyone would like. Every day, buses, railcars, station equipment, fare systems, maintenance shop equipment, and track and signal infrastructure help determine whether customers reach their destinations safely and on time or face delays, missed connections, or frustrating service disruptions.

Maintenance is therefore one of the most important ways an agency delivers reliable, on-time service. Every maintenance decision affects vehicle operations, station accessibility, customer trust, technicians’ work, and the availability of critical parts.

 The challenge is cutting through the noise to focus on what matters most, distinguishing activities that improve reliability from those that add work.

 Reliability-Centered Maintenance, or RCM, gives agencies a proven and practical way to make that distinction. Instead of focusing on “ticking and flicking” routine maintenance tasks, RCM asks the questions that matter most:

• What is the function of this asset?
• How can it fail?
• What happens if it fails?
• And what maintenance action would actually help prevent or manage that problem?

This process is especially powerful in transit because equipment failures are often visible to customers and directly impact service. A railcar door problem can slow down an entire line. A bus air-conditioning failure on a hot day can affect both customers and operators. An escalator outage at a busy station can disrupt passenger flow within minutes. A charger failure can keep several battery electric buses from leaving the garage. RCM helps agencies focus on the failures that most affect passengers, operators, and maintenance teams, allowing them to direct resources where they will have the greatest operational and customer-service benefit.

What RCM is and What It is Not

At its simplest, RCM determines the most effective maintenance strategy for a piece of equipment. It starts with what the equipment is supposed to do, how it might stop doing it, and what would happen if it failed. The basic question is straightforward: what should we do to ensure this performs as required, and how?

RCM is sometimes misunderstood. It does not mean doing more preventive maintenance on every component. It is not a software program or dashboard. It is also not a replacement for the experience of mechanics, supervisors, operators, and engineers. Tools and data can help, but the real value comes from using that information to make more informed maintenance decisions.

RCM recognizes that not every failure deserves the same response. Some failures create safety concerns. Some interrupt service or reduce accessibility. Some lead to customer complaints or unnecessary cost. Others may be minor enough to fix after they happen. RCM helps agencies decide which failures require proactive attention and which can be managed with a simpler approach.

Consider railcar doors. Under an RCM approach, an agency would not simply inspect the door system because it appears on a checklist. It would look at what the doors need to do, how they typically fail, and which failures cause the biggest problems. If a door issue affects safety, station dwell time, train availability, or on-time performance, the maintenance plan should focus directly on those risks.

Used well, RCM gives agencies a clearer framework for maintenance decision-making. It helps explain why one asset needs close monitoring, another needs periodic overhaul, another should be redesigned, and another can be repaired after it fails. It moves the discussion from “Did we check the box?” to “Did the work improve reliability and service performance?”

Practical RCM Applications for Transit Equipment

RCM is most useful for assets that directly affect service delivery. That can include rolling stock, station equipment, facility systems, signals, communications equipment, and battery-electric bus chargers.

The goal is not to study every component at the same level of detail. It is to start with those assets whose failures have the greatest impact on safety, reliability, accessibility, cost, or customer experience.

Good starting points for rail-related rolling stock equipment are systems that repeatedly disrupt service or create clear safety and operating concerns. Common examples include railcar doors, brakes, propulsion systems, HVAC equipment, air compressors, and onboard controls. RCM helps separate minor defects from failures that affect service, then points the agency to the maintenance tasks most likely to make a difference.

For bus fleets, RCM can help agencies address recurring road calls, missed pullouts, and seasonal reliability problems. A bus air-conditioning failure in mild weather may be an inconvenience. The same failure during extreme heat can quickly become a service and customer comfort issue. RCM helps the agency decide whether the appropriate intervention is enhanced seasonal checks, condition monitoring, improved parts availability, technician training, or a design modification.

Station and facility equipment are just as important. Elevators, escalators, pumps, ventilation systems, emergency generators, lighting, fare equipment, and communications systems all support the passenger experience and daily operations. At a busy transfer station, an escalator outage can affect passenger flow, accessibility, crowding, and station operations. RCM helps agencies decide where extra maintenance attention is justified and where it may not be necessary

Newer technologies also benefit from this approach. Battery-electric bus programs depend on both the vehicle and the charging system. A connector issue, software fault, utility interruption, or facility power problem can prevent several buses from going into service. RCM helps agencies identify the weak points most likely to affect pullout and decide what maintenance, monitoring, backup plans, or spare parts are needed.

RCM can also support capital planning. Sometimes maintenance alone is no longer enough because a system is worn out or has long passed its intended useful life. In that case, the right answer may be renewal, redesign, added backup capacity, or planned replacement, not an increased inspection interval. RCM analysis allows asset owners to make these decisions.

For agencies with limited staff and tight budgets, that kind of focus can be a game changer. RCM helps teams decide where maintenance attention is most needed and where a simpler approach is acceptable. It helps agencies spend less time chasing the loudest problem of the day and more time managing the failures that matter most to safe, reliable service.

Start Small, Learn Fast, Scale What Works

Transit agencies do not need to wait for perfect data or a systemwide transformation to get started.

A practical first step is to choose one high-impact asset group — such as railcar doors, bus HVAC systems, escalators, elevators, propulsion equipment, or charging infrastructure — and run a focused RCM pilot. Bring maintenance, operations, engineering, asset management, safety, procurement, and finance to the same table. Use the data you have, listen carefully to frontline experience, identify the failures that create the biggest service consequences, and adjust the maintenance strategy around those risks.

Then measure what changes. Are there fewer repeat failures? Fewer road calls or missed pullouts? Better asset availability? Fewer customer-facing outages? If yes, build on it. If not, refine the approach and try again. Make maintenance decisions more intentional, more transparent, and more closely tied to the service outcomes riders and employees experience every day.

Conclusion: From Maintenance Activity to Reliability Outcomes

RCM is not about making maintenance programs more complicated or adding work for teams already stretched thin. Its value is in helping agencies make clearer choices about where maintenance effort will make the biggest difference. By starting with what the asset needs to do, how it can fail, and why those failures matter, agencies can better connect maintenance work to safety, reliable service, customer experience, cost control, and long-term asset performance.

For passengers and operators, the benefits are easy to understand: fewer missed pullouts, fewer repeat failures, fewer station equipment outages, and greater confidence that the system will work as expected. For maintenance leaders and asset managers, RCM provides a practical way to prioritize limited resources, improve preventive maintenance, support capital planning, and explain why some assets need more attention than others.

As agencies manage aging infrastructure, new technologies, workforce constraints, and rising expectations for dependable service, RCM offers a useful path forward. It shifts the focus from scheduled maintenance to the right maintenance, reducing risk and improving reliability. That shift is where RCM delivers its greatest value.

About the Author: Chris Wenzis senior vice president, Asset Management, and Nilmino Roberts is senior vice president and transit sector lead, Asset Management, for WSP in the U.S.