Train v. Colorado Public Interest Research Group, Inc.

426 U.S. 1 · Decided June 1, 1976 · Supreme Court of the United States

At a glance

Train v. Colorado Public Interest Research Group, Inc. was decided on June 1, 1976 unanimously (8–0). The Court reversed the lower court's decision. Justice Thurgood Marshall wrote the opinion of the Court. SCDB classifies its main issue as “Natural resources and environmental protection” in the Economic Activity area.

Read the opinion

• CourtListener (Free Law Project) — opinion text
• Library of Congress — official U.S. Reports scan

Case details

How the Justices voted

Did not participate: John Paul Stevens.

Full case caption

Train, Administrator, Environmental Protection Agency, et al. v. Colorado Public Interest Research Group, Inc., et al.

SCDB identifiers: case 1975-105, docket 1975-105-01.

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Other cases on “Natural resources and environmental protection”

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  426 U.S. 128Decided June 7, 19769–0Warren E. Burger
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  427 U.S. 246Decided June 25, 19769–0Thurgood Marshall
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  427 U.S. 390Decided June 28, 19767–2Lewis F. Powell Jr.
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  430 U.S. 112Decided February 23, 19778–0John Paul Stevens

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Cases on the same legal provision: Clean Water Act (Federal Water Pollution Control Act)

• Environmental Protection Agency v. California ex Rel. State Water Resources Control Board
  426 U.S. 200Decided June 7, 19767–2Byron R. White
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  448 U.S. 242Decided June 27, 19808–1William H. Rehnquist
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  503 U.S. 607Decided April 21, 19926–3David H. Souter
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• Friends of the Earth v. Laidlaw Environmental Services (Toc), Inc.
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Same Term, same area (Economic Activity)

• Day & Zimmermann, Inc. v. Challoner
  423 U.S. 3Decided November 3, 19758–0Per curiam
• Transamerican Freight Lines, Inc. v. Brada Miller Freight Systems, Inc.
  423 U.S. 28Decided November 12, 19759–0Harry A. Blackmun
• American Foreign Steamship Co. v. Matise
  423 U.S. 150Decided December 16, 19758–0Thurgood Marshall
• Foremost-McKesson, Inc. v. Provident Securities Co.
  423 U.S. 232Decided January 13, 19768–0Lewis F. Powell Jr.
• Michelin Tire Corp. v. WagesAltered precedent
  423 U.S. 276Decided January 14, 19768–0William J. Brennan Jr.
• United States v. Bornstein
  423 U.S. 303Decided January 14, 19765–3Potter Stewart

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Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error