How do you calculate heavy-haul transport cost for a TBM?

Multiply oversize load miles by the rate per mile and by the billable route share, then add the permit and escort mobilization. Here: 420 miles × $38 × 0.90 + $42,000 = $56,364 total.

What does billable route share mean?

It's the fraction of the routed miles actually invoiced at the oversize heavy-haul rate — reflecting deadhead, mileage at reduced rates, or portions the shipper absorbs. At 90% it means 10% of the routed miles aren't billed at the full oversize rate.

What is the cost per mile in this example?

Total cost divided by oversize load miles: $56,364 ÷ 420 = $134.20 per mile. That figure includes the amortized $42,000 permit and escort adder, which is why it's well above the $38/mile linehaul rate.

Why are permits and escorts a fixed adder rather than per-mile?

Permit fees, route surveys, and pilot-car mobilization are largely triggered by the move itself and the states crossed, not by incremental miles. Treating them as a flat adder ($42,000 here, the full fixed portion of the bill) reflects that they're mostly independent of exact mileage.

How can I lower TBM transport cost?

The biggest levers are reducing oversize miles by choosing a launch shaft nearer the yard, minimizing states crossed to cut permit and escort mobilization, and breaking the machine into fewer, more transport-efficient sections to lower the heavy-haul rate tier.

Does this include loading and rigging at each end?

No. This estimates linehaul plus permits and escorts. Crane time, self-propelled modular transporter setup, and rigging at the yard and shaft are separate — fold them into the mobilization adder if you want an all-in delivered number.

Tunnel Boring & Heavy Civil Equipment calculator

Transport Cost Calculator

Transport cost for tunnel-boring equipment estimates the delivered freight bill for moving oversize, over-weight TBM sections — shield cans, cutterheads, gantries — from the assembly yard to the launch shaft. It combines the linehaul (miles times a heavy-haul rate), a billable route share that captures the fraction of the route actually invoiced at the oversize rate, and a fixed adder for permits, pilot cars, and route survey mobilization. Project logistics leads and estimators use it during bid preparation and mobilization planning because heavy-haul on a wide load can dwarf the machining cost of the part being moved, and a single missing state permit can idle a convoy for days. Getting this number right protects the tunnel launch date and the mobilization line of the budget.

What this calculator does

Estimates the cost to move TBM and heavy civil components over the road from per-mile heavy-haul rate, billable route share, and fixed permit and escort mobilization.
Use it when planning launch-shaft logistics to weigh per-mile superload hauling against the fixed permit and escort costs that apply regardless of distance.
It multiplies oversize miles by the heavy-haul rate and the billable route share, then adds the fixed permit and escort mobilization to give a total and a per-mile figure.

Formula used

Total = oversize miles x heavy-haul rate x (billable share ÷ 100) + permit mobilization
Per mile = total cost ÷ oversize load miles

Inputs explained

Oversize Load Miles:
Heavy-Haul Rate per Mile:
Billable Route Share:
Permits & Escort Mobilization:

How to use the result

Use it when quoting a TBM delivery, comparing routing options, or setting the mobilization budget line before a convoy moves.
The billable-share and flat mobilization approach smooths over real-world step costs — a single super-load bridge crossing or utility lift can add tens of thousands that no per-mile average captures.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate heavy-haul transport cost for a TBM? Multiply oversize load miles by the rate per mile and by the billable route share, then add the permit and escort mobilization. Here: 420 miles × $38 × 0.90 + $42,000 = $56,364 total.
What does billable route share mean? It's the fraction of the routed miles actually invoiced at the oversize heavy-haul rate — reflecting deadhead, mileage at reduced rates, or portions the shipper absorbs. At 90% it means 10% of the routed miles aren't billed at the full oversize rate.
What is the cost per mile in this example? Total cost divided by oversize load miles: $56,364 ÷ 420 = $134.20 per mile. That figure includes the amortized $42,000 permit and escort adder, which is why it's well above the $38/mile linehaul rate.
Why are permits and escorts a fixed adder rather than per-mile? Permit fees, route surveys, and pilot-car mobilization are largely triggered by the move itself and the states crossed, not by incremental miles. Treating them as a flat adder ($42,000 here, the full fixed portion of the bill) reflects that they're mostly independent of exact mileage.
How can I lower TBM transport cost? The biggest levers are reducing oversize miles by choosing a launch shaft nearer the yard, minimizing states crossed to cut permit and escort mobilization, and breaking the machine into fewer, more transport-efficient sections to lower the heavy-haul rate tier.

Last reviewed 2026-05-12.