Professional BIM & VDC Services for Transportation and Infrastructure

Professional BIM & VDC Services for Transportation and Infrastructure

Airport terminals, transit stations, and rail facilities run on electrical systems that span hundreds of thousands of square feet and must be coordinated with signaling, fire alarm, communications, and site power at the same time. SJS VDC has delivered electrical BIM services for Transportation Projects including international airport facilities up to 500,000 sq ft in Atlanta — producing full coordination models, 840-sheet layout packages, and as-built documentation on active-construction schedules.

Our BIM team provides precise modeling and coordination for transportation projects, especially airports. We ensure seamless integration of specialized systems, phased construction, and complex zones, delivering safe, efficient, and uninterrupted operations.

Critical Project Requirements

  • Phased Execution: Airports must remain operational during renovations or expansions. Models therefore include existing systems, demolition, and new construction, managed with precise phases, filters, and sequencing.

  • Specialized Systems: Airports require GSE (Ground Support Equipment) and 400Hz systems. These demand unique solutions: limited routing lengths, minimal bends, underground conduits, vendor coordination, and integration with external infrastructure.

  • Complex Coordination: From tight pathways to multiple overlapping systems, every component must align to ensure efficiency and reliability.

Here's what our satisfied customers say

Joe Migliore

Confirmed review

CAD & BIM Manager / Pre-Fab Manager

“Thank you for your support to us on the DPI project. We know that there is a very good VDC team out there that we can count on when we have more than we can handle.”
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Clint Sutherland

Confirmed review

Project Designer

“Big thanks for the Tumblr, the one-of-a-kind coaster, and the thoughtful vibe overall — really appreciated.”
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Michael Topper

Confirmed review

Project Manager

“I want to express my sincere thanks for all the efforts the SJS Team made in 2024. The project has been demanding, but without hesitation, you met each challenge head-on and delivered an exemplary product.”
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Michael

Confirmed review

Project Manager

“You and the SJS Team are like a breath of fresh air when it comes to coordination companies. When SJS arrives there is a resurgence of hope. Keep up the great work. Have a great weekend!”
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Chandler Denton

Confirmed review

Project Manager

“Hey! I've been very impressed with how well your team is operating. I really appreciate how quickly you guys have been able to jump in get things moving with this project.”
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Matthew

Confirmed review

Virtual Designer

“We're thoroughly impressed by your exceptional work on the conduit layouts. The attention to detail sets your work apart. Thank you for delivering such outstanding results!”
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Electrical Coordination Challenges in Transportation Projects

Transportation construction compresses electrical coordination pressure because the systems involved are not just numerous — they operate at different voltages, serve different life-safety functions, and are installed in sequences governed by phased civil work or active operations.

  • Complex Multi-System Coordination — A single transportation facility requires simultaneous modeling of power distribution, site lighting, emergency systems, AV infrastructure, FA systems, and grounding, each governed by separate specifications and separate trades. Without a unified electrical BIM model, clash detection across these systems is effectively blind.
  • Large-Scale Cable Routing — Power feeders and cable tray in airport terminals and transit facilities span distances that create routing conflicts across structural bays, expansion joints, and equipment rooms. Conduit paths must be resolved at model stage to prevent field reroutes on a critical-path schedule.
  • Coordination with Signaling and Communication Systems — Signaling and data conduit in transit and rail environments share overhead zones with power distribution. Physical separation requirements — and EMI-related spacing — must be defined in the model before installation drawings are issued.
  • Safety and Emergency Systems — Life-safety circuits in transportation facilities follow NFPA 130, FAA advisory circulars, or authority-specific standards depending on asset type. Routing must be segregated from standard power and documented to AHJ requirements throughout.
  • Phased Construction and Active Operations — Many transportation upgrades occur on facilities that remain operational. Electrical models must reflect phase boundaries, temporary power conditions, and sequence-specific tie-in points — not just the final design state.
  • Strict Standards and Approval Requirements — FAA, FTA, state DOTs, and airport authorities maintain review processes that require precise documentation at every submittal stage. BIM deliverables must meet LOD, format, and content requirements set outside the general contractor's standard spec.

How We Approach Electrical BIM for Transportation Projects

Transportation projects require a BIM approach built around systems interdependency and sequential install logic — not the floor-by-floor progression that works on commercial builds.

Conduit and Cable Tray Routing

Transportation facilities have overhead zones claimed by structural steel, mechanical ductwork, signaling conduit, and communications cable at the same time. SJS models electrical conduit and cable tray with system-separation spacing defined from project specifications, routing planned against structural constraints before any clash detection is run. On the Atlanta International Airport Facility, early multi-trade coordination zones were applied in congested overhead areas to reduce field revisions and speed up approvals.

Panel and Equipment Modeling

Electrical equipment rooms in airports and transit facilities are dense — main switchgear, distribution panels, UPS, and generator connections share constrained spaces with competing MEP systems. SJS models equipment to manufacturer dimensions with code-required clearances, producing installation drawings that reflect actual field conditions.

Clash Detection

Transportation projects involve more trades with more separation requirements than most construction types. SJS runs clash detection across electrical systems and all intersecting trades, with specific attention to life-safety circuit separation, signal interference corridors, and clearance requirements. Clash reports are structured for GC coordination meetings, not raw exports.

Shop Drawings and Prefab Support

Prefabrication is the standard approach on large transportation builds because restricted access windows and strict sequencing make in-place assembly slow. SJS produces shop drawings at the detail level required for off-site fabrication: bend radii, fitting types, support spacing, and wire fill calculations confirmed before drawing release.

Who We Work With on Transportation Projects

Transportation builds typically involve a general contractor coordinating between the electrical contractor, civil and structural teams, MEP subcontractors, and the owner's technical representatives — often a transportation authority running its own review process parallel to the GC's schedule.

General Contractors

GCs on airport, transit, and rail projects manage coordination between trades operating under sequenced access windows and authority review cycles. SJS delivers models and drawings on schedule, maintains the coordination model through design changes, and provides clash documentation formatted for multi-trade coordination meetings.

Electrical Contractors

Electrical contractors on transportation projects face install conditions that differ from standard commercial work: restricted access to active operational areas, tagging and documentation requirements tied to authority submittals, and prefab sequences with off-site lead times. SJS produces layout drawings, conduit schedules, and shop drawings at the detail level required for field crews and prefab shops without additional interpretation.

Engineering and Design Firms / Transportation Authorities

Design teams and owner technical representatives need electrical BIM models that reflect current design intent, are maintained through RFI and bulletin cycles, and can support AHJ submittals. SJS delivers coordination models with full as-built documentation — including the 840-sheet layout packages and updated as-built models produced on completed airport projects.

Electrical BIM & VDC Services for Transportation Projects FAQ

What LOD is typically required for electrical BIM on airport or transit projects?

Transportation authorities typically require LOD 350 for coordination and LOD 400 for construction documents. The specific requirement is set by the project's BIM Execution Plan and may reference AIA G202 or a project-specific LOD matrix. SJS confirms LOD requirements per system before production begins — electrical equipment, conduit, and supports each carry different LOD thresholds in most transportation BEPs.

How does electrical BIM coordination work when a facility stays operational during construction?

Active-operations projects require the model to reflect phase boundaries — which areas are live, which are under construction, and where temporary power or isolation points apply. This means maintaining multiple model states through the build, not a single design-complete model. Clash detection and coordination drawings are run against the active phase scope, not the finished design.

What file formats are used for electrical BIM deliverables on transportation authority projects?

Most transportation authorities require Navisworks NWD or NWC files for model review, with IFC export for owner-maintained federated models. Revit is the production format at SJS. Model structure — naming conventions, shared coordinate setup, and workset organization — is confirmed with the GC and owner's BIM manager at project kickoff to meet authority requirements.

How is electrical conduit routed when signaling and communications conduit share the same overhead zone?

Separation requirements between power and signal conduit are modeled explicitly. SJS defines separation corridors in the coordination model based on project specifications — typically 12" minimum horizontal separation or as set by the project's telecom engineer — and routes electrical conduit to maintain those corridors before drawings are issued. Remaining conflicts are flagged in clash reports for trade coordination review.

How are shop drawings managed on a transportation project with multiple construction phases?

Shop drawings are issued by phase and tied to the construction sequence, not released as a single full-project package. Each release covers the conduit and equipment scope active in the upcoming phase, with wire fill calculations, fitting schedules, and support details confirmed against the current design. Changes from previous phases are tracked and carried forward into subsequent releases.

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