49 CFR § 174.86 - Maximum allowable operating speed.
---
identifier: "/us/cfr/t49/s174.86"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 174.86 - Maximum allowable operating speed."
title_number: 49
title_name: "Transportation"
section_number: "174.86"
section_name: "Maximum allowable operating speed."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "174"
part_name: "CARRIAGE BY RAIL"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5101-5128; 33 U.S.C. 1321; 49 CFR 1.81 and 1.97."
cfr_part: "174"
---
# 174.86 Maximum allowable operating speed.
(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.
(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.
[74 FR 1801, Jan. 13, 2009]