Skip to content
RailForgeRFScore

Bridge load rating · upgrade cost

Will the bridge carry a 286k car, or does the corridor stop at the river?

Most rural short-line bridges built before 1970 are E40 to E60. That means they cannot take a fully loaded modern Class I car without speed restrictions, posting, or refusal at interchange. This is the triage: AREMA Cooper rating in, yes or no out, with the upgrade cost band if the answer is no.

AREMA Chapter 15 + FRA 49 CFR 237 calibrated · mid-2026 dollars · triage only, not engineering

What this is

  • Yes / no / marginal verdict against the AREMA Cooper rating required for the target car class
  • Strategy recommendation: replace, rehab, in-place strengthen, or no action
  • ROM upgrade cost band, low to high, by bridge type and region
  • Deferred-maintenance penalty: NPV at 7% over 20 years of doing nothing
  • Mobilization 7.5% + contingency 25% (bridge work standard, higher than spur)
  • Downloadable triage summary (.txt)

What this is NOT

  • A defended load rating. AREMA Chapter 15 member-by-member analysis is required.
  • A 49 CFR 237 inspection. Annual inspection by a qualified bridge engineer is still required.
  • A defended budget. Geotech for substructure work and operating-railroad coordination on work windows are required first.

Bridge load rating triage

Will the bridge carry a 286k car? Or does the corridor stop at the river?

Short-line and industrial owners cannot interchange modern Class I traffic without an AREMA Cooper rating that supports the target car class. This is the triage: yes, no, or marginal, with the upgrade cost band if the answer is no.

Bridge geometry

Service profile

Cooper E-rating reference

  • E80: full modern Class I, 286k unrestricted, 315k with review
  • E72: 286k OK, often at reduced speed on older spans
  • E60: 286k restricted, 263k OK
  • E50: 263k OK, 286k requires posting or detour
  • E40: 263k restricted, modern unit-train traffic not viable

Source: AREMA Manual Chapter 15 (Steel Structures), FRA 49 CFR 237

Defend the rating

Send the bridge for a 10-day defended load rating.

Tell us the corridor, owner, scorecard result, constraint, deadline, and procurement path. The first reply is a fit screen, record request, and recommendation on whether the 10-day brief is the right step.

Capability packet, W-9, COI, NDA, and scope letter available on request.

Posts to RailForge intake. No third-party form host. No tracking pixel. Capability packet, NDA, COI, W-9, and scope letter available on request.