(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.
(Approved by the Office of Management and Budget under control number 2130-0042)