(a) For molten metals and molten glass shipped in packagings other than those prescribed in Sec. 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]