49 CFR § 235.5 - Changes requiring filing of application.
---
identifier: "/us/cfr/t49/s235.5"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 235.5 - Changes requiring filing of application."
title_number: 49
title_name: "Transportation"
section_number: "235.5"
section_name: "Changes requiring filing of application."
chapter_name: "FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "235"
part_name: "INSTRUCTIONS GOVERNING APPLICATIONS FOR APPROVAL OF A DISCONTINUANCE OR MATERIAL MODIFICATION OF A SIGNAL SYSTEM OR RELIEF FROM THE REQUIREMENTS OF PART 236"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 20103, 20107; 28 U.S.C. 2461 note; and 49 CFR 1.89."
regulatory_source: "49 FR 3380, Jan. 26, 1984, unless otherwise noted."
cfr_part: "235"
---
# 235.5 Changes requiring filing of application.
(a) Except as provided in § 235.7, applications shall be filed to cover the following:
(1) The discontinuance of a block signal system, interlocking, traffic control system, automatic train stop, train control, or cab signal system or other similar appliance or device;
(2) The decrease of the limits of a block signal system, interlocking, traffic control system, automatic train stop, train control, or cab signal system; or
(3) The modification of a block signal system, interlocking, traffic control system, automatic train stop, train control, or cab signal system.
(b) [Reserved]
(Approved by the Office of Management and Budget under control number 2130-0042)