How ATF World Delivered the Smart Track Station Project

Introduction

Transit infrastructure projects demand precision, coordination, and speed in equal measure. When a leading North American general contractor needed an experienced coordination and steel detailing partner to support the delivery of a new Smart Track commuter rail station, they turned to ATF World.

This case study details how our team navigated complex structural steel connections, a compressed timeline, and multi-discipline coordination challenges to deliver a construction-ready model that exceeded the client's expectations.

Project Overview

• Project: Smart Track Commuter Rail Station
• Location: Greater Toronto Area, Ontario, Canada
• Scope: Structural steel detailing, multi-discipline coordination, connection design support, and CNC-ready fabrication output
• Timeline: 14 weeks from model kickoff to fabrication release
• Disciplines: Structural steel, architectural, mechanical, electrical, and civil

The station features a cantilevered canopy structure spanning the platform, exposed architectural steel connections, and integration with existing rail infrastructure — all of which demanded exceptional modeling precision and coordination rigor.

The Challenge

Complex Steel Connections

The architectural design called for exposed steel connections with tight aesthetic tolerances. Every bolted and welded connection would be visible to the public, meaning fabrication quality had to be impeccable — and that starts with the model.

Compressed Timeline

With only 14 weeks to move from modeling kickoff to CNC-ready fabrication files, there was no room for extended coordination cycles or rework. The steel had to be ordered within the first 8 weeks to meet the overall construction schedule.

Multi-Discipline Coordination

The station canopy integrates structural steel with MEP systems (lighting, electrical feeds, drainage), architectural cladding, and civil grading. Clashes between disciplines on a geometrically complex canopy structure were inevitable — the question was whether they would be caught in the model or in the field.

Our Approach

Model-First Strategy

ATF World adopted a model-first delivery approach, meaning every decision — from connection design to fabrication sequencing — was driven by the model rather than by traditional 2D drawings. This ensured a single source of truth and eliminated the translation errors that occur when detailers work from flat drawings.

LOD 400 Modeling

We modeled the entire steel structure to Level of Development 400, which includes:

• Every bolt, weld, plate, stiffener, and shim
• Exact material grades and surface treatments
• Connection details sufficient for direct CNC fabrication
• Erection sequencing and piece-mark assignments

LOD 400 is the fabrication-ready standard — no interpretation required by the steel fabricator.

Comprehensive Clash Detection

Using Autodesk Navisworks, we ran weekly clash detection cycles against the architectural, MEP, and civil models provided by other project stakeholders. Our coordination team classified and tracked every clash through resolution, ensuring zero hard clashes remained at the time of fabrication release.

4D Planning Support

We linked the structural steel model to the erection schedule to create a 4D construction sequence, allowing the general contractor to visualize the steel erection process phase by phase. This identified two potential sequencing conflicts that were resolved in pre-construction — saving an estimated 3–5 days of field downtime.

Key Deliverables

Our team delivered the following within the 14-week engagement:

• Structural steel models — Complete LOD 400 Tekla Structures model comprising over 1,200 unique steel members
• Connection details — 85+ unique connection designs modeled to fabrication precision
• CNC-ready output — DSTV (NC1) files for direct import into CNC cutting and drilling equipment
• Coordination models — Federated Navisworks models with weekly clash reports and resolution tracking
• Erection drawings — Anchor bolt plans, erection plans, and piece-mark sequences for the field crew
• 4D sequence animation — Construction phase visualization for the general contractor's planning team

Results & Impact

The project delivered measurable results across every key performance metric:

98% clash resolution rate — Only 3 minor soft clashes (clearance-related, non-critical) remained at fabrication release. Zero hard clashes.

2 weeks ahead of schedule — The fabrication package was released 2 weeks before the contractual deadline, giving the steel fabricator additional lead time and reducing schedule risk.

Estimated $180,000 in avoided rework — Based on the client's historical cost data for field-discovered clashes on comparable transit projects, the early-stage clash resolution was estimated to save approximately $180,000 in potential rework costs.

Zero RFIs related to steel detailing — The completeness of the LOD 400 model and erection documentation meant the steel fabricator and erector had no requests for information during fabrication and erection.

Client Feedback

"ATF World's team delivered a fabrication-ready model that our steel fabricator could run directly to CNC without a single modification. The weekly coordination cycles caught issues early, and the 4D sequence was a game-changer for our site planning. We will absolutely engage them on future transit projects."

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— Senior Project Manager, General Contractor (GTA Region)

Conclusion

The Smart Track Station project demonstrates how a coordination-driven approach can deliver complex infrastructure on aggressive timelines without sacrificing quality. ATF World helped the client avoid costly field surprises and stay ahead of schedule.

Whether your project involves transit infrastructure, commercial structures, or industrial facilities, our team brings the same level of precision and coordination rigor to every engagement.

Have a complex project? Contact ATF World to discuss how we can support your next build.