Manufacturing

Improving Rail Safety: Custom Lockout Enclosures

A 3D printed tamper-proof solution that secured 45 rail regulators.

Custom lockout and protective enclosures can be difficult to produce when components have unique geometries and only a small number of units are required. 3D printing provides a practical way to create precise, application-specific housings without the tooling costs and long lead times associated with conventional manufacturing. For transportation, industrial, and mechanical applications, additive manufacturing can turn a specialized design into a functional, durable component while maintaining the flexibility needed for low-volume production.

Technology

Fused Deposition Modeling (FDM)

Material

Industrial Thermoplastic

Volume

45 Units

THE CHALLENGE

The client needed to prevent unauthorized adjustments to approximately 45 air pressure regulators across an active passenger rail fleet. Standard lockout devices did not fit the unique geometry of the regulators and therefore could not provide the required level of security. Developing a custom enclosure through conventional manufacturing would have required significant engineering and tooling investment for a relatively small production run, resulting in unnecessary costs and extended lead times. A secure, precisely fitted enclosure was needed without the expense of specialized tooling for only 45 units.

Reverse-Engineered the Regulator: Measured the provided physical regulator and recreated its unique geometry in CAD to establish an accurate foundation for the custom enclosure.
Designed a Lockable Split Enclosure: Developed a multi-piece shell that precisely surrounded the regulator while preventing access to the adjustment knob and accommodating standard padlocks.
Validated the Design with Prototypes: Produced physical prototypes for fit testing and stakeholder review, refining the enclosure to ensure secure engagement and prevent rotational movement of the regulator cap.
Produced the Final Fleet Batch: Manufactured approximately 45 finished covers following design approval, providing a consistent lockout solution for installation across the required regulators.

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why it worked

The custom enclosure addressed a limitation that standard lockout devices could not: the regulator’s unique geometry required a solution designed specifically around its shape and adjustment mechanism. Reverse-engineering the physical regulator allowed the enclosure to fit securely around the existing component while the internal geometry prevented the adjustment cap from rotating. Because the enclosure was not exposed to pressurized air or direct contact with liquids, an industrial thermoplastic provided sufficient durability for the application without requiring a more specialized material. The split-piece design also provided access for installation while incorporating provisions for one or more standard padlocks, creating a secure and practical lockout solution without modifying the regulator itself.

3D printing was particularly well suited to the relatively small production run of approximately 45 units. Conventional manufacturing would have required custom tooling and substantial upfront costs that were difficult to justify for such a specialized, low-volume component. FDM production eliminated the need for dedicated tooling and allowed the design to be prototyped, reviewed, refined, and moved into final production quickly. The result was a durable, precisely fitted enclosure that met the operational requirements without the cost and lead time associated with conventional tooling.

Where a model like this fits

Custom 3D-printed enclosures are well suited to industrial, transportation, and mechanical applications where standard protective or lockout products do not match the geometry of existing equipment. The approach is particularly valuable for specialized components that require a precise fit, integrated locking features, or other application-specific design requirements without the cost of custom tooling. From equipment guards and tamper-proof covers to protective housings and access-control components, 3D printing provides a flexible and cost-effective way to produce durable, low-volume parts tailored to the exact requirements of an existing system.