Congress strips states of power to clean up railroad pollution

What it does

This bill amends the Clean Air Act to prohibit states from setting their own emission standards for existing locomotives and railroad engines. Currently, states can impose stricter pollution controls on locomotives under Section 209 of the Clean Air Act; this bill removes that authority and reserves all locomotive emission regulation to the federal government alone.

Why we flagged it

The bill's core function is to strip states of authority to regulate locomotive emissions, consolidating that power at the federal level. This is a classic preemption move that benefits the railroad industry by preventing a patchwork of state standards.

What the text implies

• States that have invested in locomotive emission reduction programs or negotiated stricter standards with railroads lose enforcement authority, potentially stranding prior regulatory investments.
• The bill's definition of 'engaged in commerce' via reference to 49 U.S.C. § 10102 (common carrier railroad transportation for compensation) may exclude short-line, switching, or industrial locomotives from federal regulation entirely, creating a regulatory gap.
• Preemption of state authority removes a competitive pressure that may have driven railroads to adopt cleaner technologies; uniform federal standards typically reflect industry input and are less stringent than state alternatives.
• Air quality in regions downwind of major rail corridors may deteriorate if federal standards are not updated to match state-level ambitions, disproportionately affecting communities near rail hubs.

Section numbers refer to the bill text the analysis read — linked under Primary records below.

Who it affects

States lose the ability to impose stricter emission standards on locomotives, which are significant sources of air pollution in many regions. Citizens in states that have pursued aggressive air-quality goals lose a regulatory tool, and those living near rail corridors may face higher local air pollution without state-level recourse.

Who stands to gain

• Class I railroads (BNSF, Union Pacific, CSX, Norfolk Southern)
• Locomotive manufacturers (Wabtec, Progress Rail)
• Short-line and regional railroads avoiding state compliance costs

Named in the bill

Clean Air Act, Section 209(e)(1), 49 U.S.C. § 10102, Class I railroads, Wabtec Corporation, Progress Rail, State environmental agencies, EPA

Where it stands

19 cosponsors: 19 Republicans.

• May 15, 2025 — Introduced · Congress.gov: “Introduced in Senate”
• May 15, 2025 — Referred to Senate Committee on Environment and Public Works · Congress.gov: “Read twice and referred to the Committee on Environment and Public Works”

Dates and quoted wording are Congress.gov's action record; the timeline shows status changes, not every procedural step.

Money around this bill

4 lobbying clients named this bill on 5 disclosure filings across 2 quarters, Dec 2025 to Jun 2026. Those filings disclosed $3,021,005 in lobbying spend. A filing names 31 bills on average, so that figure is what each filing reported, not a share belonging to this bill.

More lobbying clients named this bill than 72% of bills with at least one filing.

Joni Ernst, the sponsor, reported $342,120 in PAC receipts in the 2026 cycle. $10,000 of that came from 2 PACs tied to these lobbying clients.

• Union Pacific Corporation — $1,770,000 on 2 filings
• Bnsf Railway Company — $960,000 on 1 filing
• Csx Corporation — $251,005 on 1 filing
• Bnsf Railway Company — $40,000 on 1 filing

Lobbying Disclosure Act filings through Jul 20, 2026. A filing shows who paid to lobby on a bill it names, not what changed.