STB Sets 2Q26 Rail Cost Adjustment Factor

Why It Matters

RCAF values directly shape freight rate adjustments, influencing shipper costs and railroad earnings, making the quarterly update a key market signal.

Key Takeaways

• Unadjusted RCAF rises to 1.016, slight QoQ increase
• Adjusted RCAF falls to 0.388, indicating lower cost growth
• RCAF-5 drops to 0.368, reflecting productivity-adjusted costs
• Productivity trend 1.4% annually influences adjusted RCAF calculations
• Railroad pricing contracts reference RCAF, affecting shipper expenses

Pulse Analysis

The Rail Cost Adjustment Factor (RCAF) is a regulatory metric used by the Surface Transportation Board to translate changes in railroad input prices into contractually‑based freight rate adjustments. Three versions exist: the unadjusted RCAF, which tracks raw cost movements; the adjusted RCAF, which smooths those movements by applying a five‑year moving average of productivity gains; and the RCAF‑5, which extends that productivity adjustment back to 1989. By publishing these figures each quarter, the STB provides a transparent benchmark that shippers, rail carriers, and investors rely on for budgeting and pricing decisions.

In its March 19 decision, the STB confirmed the second‑quarter 2026 RCAF numbers: an unadjusted index of 1.016, a modest 0.1% rise from the prior quarter, while both the adjusted RCAF (0.388) and RCAF‑5 (0.368) slipped 0.3%. The underlying productivity trend of 1.014—equating to roughly 1.4% annual efficiency gains for Class I railroads—tempers the upward pressure from higher input costs. These modest shifts suggest that, despite volatile fuel and labor markets, railroads are still able to offset a portion of cost increases through productivity improvements, keeping rate hikes in check for downstream customers.

For the broader transportation sector, the RCAF update serves as a leading indicator of rail cost dynamics. Shippers use the figures to renegotiate service contracts, while equity analysts watch for signals about railroad profit margins and capital‑intensive projects. A stable or declining adjusted RCAF can bolster confidence in rail’s cost‑competitiveness against trucking, potentially influencing modal shift decisions. Looking ahead, market participants will monitor whether the productivity trend sustains its 1.4% pace, as any deviation could accelerate or dampen future rate adjustments, impacting supply‑chain budgeting and investment strategies.