Business challenges facing rail vehicle manufacturers

Our flexible products and solutions

Are you having a hard time finding a trusted supplier who can manage full project scope? Partner with a knowledgeable supplier capable of owning project scopes and supporting you throughout the vehicle lifecycle.
Do you need a product that is form, fit, and function compatible with your vehicle platforms? Provide your customers with reliable, cost-effective products for their new, retrofit, or overhaul projects.
Are you experiencing a lack of compatibility between your vehicle networks and subsystems? Choose a network system integrator with extensive expertise delivering fully customized train network solutions for new and modernization projects.
Are you frustrated with under-performing suppliers? Enjoy peace of mind and increase customer retention by collaborating with a top-ranked company in project, supply chain, factory, and quality audits.
Do you encounter delays in project delivery, incomplete documentation, and overall poor communication with your suppliers? Select a trusted supplier with strong scope management abilities, comprehensive documentation, and long-standing experience working closely with rail vehicle manufacturers.

Our promise

We strive to exceed rolling stock manufacturers' supply-chain requirements by delivering products and services founded upon three promises:


Why work with Quester Tangent

A to Z industry experience

We have more than 20 years of experience in designing modular solutions, building flexible products, providing system and network integration, and engineering services. We produce complete documentation, including product specifications, fault management plan, training materials, and user manuals.

20-year service guarantee

We stand behind our products for the train’s service lifecycle. On a pro rata basis, we will cover our product support costs to provide our customers 20 years of service continuity for train electronics delivered into new build, retrofit, and overhaul projects.

Risk reduction

Quester Tangent proactively reduces technical and contractual risks for rolling stock manufacturers by committing to deliver all aspects of the project scope. We have strong internal processes in place to ensure consistent design, production, integration, and on-time delivery of allocated scope.

Obsolescence management

Quester Tangent maximizes the lifespan of its products and reduces the total cost of ownership. We provide our customers with annual reports to identify End-of-Life (EOL) concerns with our equipment and proactive notifications with a defined timeline and action plan for resolving EOL issues.

One-stop shop

We are an independent company with complete in-house electrical, mechanical, software, and system engineering capabilities, assisted by project management and manufacturing expertise. As your one-stop shop for train electronics, we excel at meeting our contract requirements on time and on budget.

Quality assurance

We have mature processes, industry-compliant products, and strong business practices backed by top-ranking project and supply chain quality audits. We drive operational expansion from the top down to ensure efficiency and growth. We hone our systems from the bottom up by embracing external and internal audits and feedback to increase customer and employee satisfaction.

Technology partner

Quester Tangent is a trusted partner of the rail transit industry and a leader in integrating innovative technology into train systems. We work with consultants and transit authorities by supporting them early on to clearly define their needs and advise them on their technology options before project tenders are released.

Midlife renewal support

Quester Tangent builds flexible products supported by a long-lasting service guarantee. We can easily support overhaul and retrofit projects by designing and delivering products that adapt to the form, fit, and function needs of our customers’ existing fleet or to meet new and additional requirements.

Featured products

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Featured projects

Read NJT case study
New build project

An integrated MDS with multiple network functionality and train-to-wayside communication, followed by a seamless expansion.

Read MARTA case study
Retrofit project

A monitoring system, delivered for a retrofit that enhances operational efficiency and supports superior train-to-wayside communication.

Read PATCO case study
Overhaul project

A comprehensive on-train and WMDS with seamless network integration for improved operations, maintenance, and secure wayside communications.

View all projects