Case Studies
Re-engineering Critical Rail Components to Overcome Supply Constraints
SMRT Trains eCard Lifecycle Overhaul, Singapore
A mandatory 12-year overhaul requirement for Auxiliary Power Supply and Propulsion electronic cards created a critical delivery risk. OEM replacement lead times had stretched beyond 500 days while the overhaul schedule remained fixed. Without intervention, the programme risked falling behind schedule and exposing operations to potential service disruption from ageing or unserviceable power-system components.
Rather than accept dependency on full card replacement, STRIDES developed a component-level overhaul methodology that shifted the solution from procurement to engineering, establishing a technically sound and cost-effective path to sustain critical systems within the required timeframe.
The Challenge
Electronic cards governing Auxiliary Power Supply and Propulsion systems are safety-critical components in train operations. When OEM replacement lead times stretched beyond 500 days, the conventional replace-the-unit approach became untenable. The overhaul schedule was fixed and non-negotiable. A new approach was needed that could deliver within the required timeframe without compromising safety, quality, or regulatory compliance.
The Approach
Rather than treating the eCards as sealed replacement items, STRIDES developed a structured component-level overhaul methodology focused on identifying and replacing only the life-limited or failure-prone elements within each card, particularly electrolytic capacitors, while retaining the rest of the serviceable assembly.
The methodology was built for repeatability, control, and disciplined execution. Specific failing components were identified and sourced independently, removing the dependency on OEM supply chains entirely. Systematic work instructions and material kits were developed to guide technicians consistently through each refurbishment. Strict labelling and traceability processes ensured full control over every repaired unit from intake to redeployment.
A new certified process standard was established to align the overhaul method with safety, quality, and regulatory requirements, including SSB and LTA expectations. Formal risk assessments, detailed work instructions, inspection standards, and IPC compliance requirements were embedded into the methodology from the outset, ensuring the approach met the same standard as OEM replacement while delivering it on a fraction of the lead time.
This transformed a high-risk maintenance bottleneck into a sustainable in-house engineering capability, reducing OEM dependency, strengthening internal technical expertise, and creating a more flexible support model for future lifecycle interventions.
Measurable Impact
100% adherence to the overhaul schedule
OEM lead-time dependency of over 500 days eliminated
More than $21 million in cost savings
In-house high-level electronic repair and re-engineering capability established
The programme is proof that supply-chain constraints can be resolved through disciplined engineering innovation, turning an apparently unmanageable procurement problem into a certified, repeatable, and cost-effective overhaul capability.
Services
Electronic Component Overhaul and Life Extension / Planned Maintenance and Work Scheduling / Maintenance Digitalisation / Safety Culture and Regulatory Alignment