{"operation":"document","citation":"49 CFR 174.86","title":"Maximum allowable operating speed.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"(a) For molten metals and molten glass shipped in packagings other than those prescribed in § 173.247 of this subchapter, the maximum allowable operating speed may not exceed 24 km/hour (15 mph) for shipments by rail.\n\n(b) For trains transporting any loaded, placarded tank cars containing a material","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-174-86.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-174-86.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-174-86","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-174.86","body":"(a) For molten metals and molten glass shipped in packagings other than those prescribed in § 173.247 of this subchapter, the maximum allowable operating speed may not exceed 24 km/hour (15 mph) for shipments by rail.\n\n(b) For trains transporting any loaded, placarded tank cars containing a material poisonous by inhalation, the maximum allowable operating speed may not exceed 80.5 km/hour (50 mph) for shipments by rail.\n\n[74 FR 1801, Jan. 13, 2009]","truncated":false,"body_characters":452}