Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, each of the undersigned hereby agrees to the joint filing, along with all other such undersigned, on behalf of the Reporting Persons (as defined in the joint filing), of a statement on Schedule 13D (including amendments thereto) with respect to the common stock, par value $1.00 per share, of CSX Corporation, and that this agreement be included as an Exhibit 99.1 to such joint filing. This agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument. The undersigned acknowledge that each shall be responsible for the timely filing of any amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others.

IN WITNESS WHEREOF, each of the undersigned hereby executes this agreement as of this 26th day of October, 2018.

MR ARGENT ADVISOR LLC
By:	Mantle Ridge LP, its sole member
By:	Mantle Ridge GP LLC, its general partner
By:	PCH MR Advisor Holdings LLC, its managing member
By:	/s/ Paul C. Hilal
	Paul C. Hilal
	Sole Member
MANTLE RIDGE LP
By:	Mantle Ridge GP LLC, its general partner
By:	PCH MR Advisor Holdings LLC, its managing member
By:	/s/ Paul C. Hilal
	Paul C. Hilal
	Sole Member
	/s/ Paul C. Hilal
	Paul C. Hilal