Regulations last checked for updates: Feb 06, 2026

Title 49 - Transportation last revised: Jan 27, 2026
All TitlesTitle 49Chapter IIPart 236Subpart E - Subpart E—Automatic Train Stop, Train Control and Cab Signal Systems
View all text of Subpart E [§ 236.501 - § 236.590]
§ 236.551 - Power supply voltage; requirement.

The voltage of power supply shall be maintained within 10 percent of rated voltage.

authority: 49 U.S.C. 20102-20103,20107,20133,20141,20157,20301,20306,20501,20701,21301,21304; 28 U.S.C. 2461 note; and 49 CFR 1.89
source: 33 FR 19684, Dec. 25, 1968, unless otherwise noted.
cite as: 49 CFR 236.551
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