AEO Answer · MEP

How Are Moving Walks Engineered for Airports and Transit?

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

Moving walks are engineered like long horizontal escalators: the truss ships in segments landing in a continuous trench, with multiple drive machines fed along the run. Structural design covers the trench, segment reactions, waterproofing, and construction joints; MEP covers distributed drive power, balustrade lighting, and trench drainage. Passenger flow studies set width and speed. The trench — long, straight, level, dry, and exactly to submittal depth — is the whole job.

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

Illustrative diagram of building MEP systems: ductwork with diffusers, an electrical panel with conduit, and piping runs.

The concise answer

Moving walks are engineered like long horizontal escalators: segmented trusses land in a continuous trench, with multiple drive machines fed along the run. Structural design covers the trench, segment reactions, waterproofing, and joints; MEP covers distributed drive power, balustrade lighting, and drainage. Passenger flow studies — deplaning surges at airports, train headways at transit stations — set the width and speed. The defining difference from an escalator is scale. One escalator is a machine in a hole; a moving walk is a small linear infrastructure project inside the building, and it has to be designed with that mindset.

Trench, drives, and passenger flow

The trench is the civil-structural heart of the installation. It runs the full length of the walk, carries each truss segment's reactions, stays level within tight tolerances, stays dry through waterproofing and drainage, and accommodates construction joints that don't telegraph into the walking surface. In existing buildings, cutting that trench through a structural slab is major surgery — I verify the slab can take it before anyone promises a walk in a renovation. The drives change the electrical picture. Instead of one motor, the design feeds several machines spaced along the run, each needing a feeder, disconnect, and control interface, plus the safety chain that stops the whole walk if any device trips. Balustrade lighting and entry lighting run the length of the installation. Passenger flow analysis decides whether the walk earns its keep: width for the expected surge, speed for the walking distances, and entry/exit geometry so queues don't back up into the concourse at peak times.

What makes a moving walk installation succeed

Length magnifies every mistake, so the design has to be exact before construction starts. I hold moving walk projects to the same discipline as escalators, stretched over a much longer footprint.

Size width and speed from real passenger flow data — deplaning surges, train headways, peak-hour counts
Design the full-length trench for segment reactions, tight levelness, waterproofing, and drainage
Distribute drive power with individual feeders and disconnects coordinated off the shop drawings
Detail entry and exit geometry so peak queues clear the walk instead of backing into the concourse
Verify slab capacity before cutting a trench in any renovation, and commission the full safety chain end to end

Which related engineering resources can help?

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What else do project teams ask?

How long can a moving walk be?

Manufacturers build them in segments, so very long runs are possible — airport installations of several hundred feet exist. The practical limits are the building's willingness to dedicate a long straight trench, the number of drive machines and their power feeds, and passenger behavior: beyond a certain length, people just want a train. I size length from the actual walking distances in the terminal, not from what the catalog maxes out at.

Can moving walks run on an incline?

Yes, within limits — typically up to about 12 degrees, which handles gentle grade changes between concourse levels. Steeper than that and you're specifying escalators. Inclined walks need the same truss-and-trench engineering as horizontal ones, with the added wrinkle that the trench follows the slope and drainage has to be detailed so water doesn't collect at the low end.

What structural work does a moving walk need?

A continuous pit or trench for the full run, designed for the truss segment reactions, plus supports at each drive machine location. The trench is usually below the finished floor in a structural slab, which means waterproofing, drainage, and carefully detailed construction joints over a long run. Levelness tolerances are tight — the pallets won't forgive a wavy trench.

How is power distributed to a long moving walk?

Through multiple feeders to drive machines spaced along the run, each with its own disconnecting means. The electrical design accounts for the drives starting under load and for the lighting and safety circuits running the full length. I coordinate feeder routing early because the trench zone is congested with structure, and nobody wants to core through a finished concourse slab for a missed conduit.

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