<SEC-DOCUMENT>0001209191-21-061524.txt : 20211025
<SEC-HEADER>0001209191-21-061524.hdr.sgml : 20211025
<ACCEPTANCE-DATETIME>20211025170331
ACCESSION NUMBER:		0001209191-21-061524
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20211021
FILED AS OF DATE:		20211025
DATE AS OF CHANGE:		20211025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Williams Angela C
		CENTRAL INDEX KEY:			0001735776

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08022
		FILM NUMBER:		211344871

	MAIL ADDRESS:	
		STREET 1:		500 WATER STREET
		CITY:			JACKSONVILLE
		STATE:			FL
		ZIP:			32202

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CSX CORP
		CENTRAL INDEX KEY:			0000277948
		STANDARD INDUSTRIAL CLASSIFICATION:	RAILROADS, LINE-HAUL OPERATING [4011]
		IRS NUMBER:				621051971
		STATE OF INCORPORATION:			VA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		500 WATER STREET
		STREET 2:		15TH FLOOR
		CITY:			JACKSONVILLE
		STATE:			FL
		ZIP:			32202
		BUSINESS PHONE:		9043593200

	MAIL ADDRESS:	
		STREET 1:		500 WATER STREET
		STREET 2:		15TH FLOOR
		CITY:			JACKSONVILLE
		STATE:			FL
		ZIP:			32202
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
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            </exerciseDate>
            <expirationDate>
                <value>2029-02-06</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7356</value>
                    <footnoteId id="F9"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3786</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>26.50</value>
                <footnoteId id="F10"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-10-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7818</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F10"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>26.50</value>
                    <footnoteId id="F10"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2021-02-18</value>
            </exerciseDate>
            <expirationDate>
                <value>2030-02-18</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7818</value>
                    <footnoteId id="F10"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15639</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 18, 2021.  The plan has been approved pursuant to the terms of the Issuer's policies and is part of the Reporting Person's strategy to diversify assets.</footnote>
        <footnote id="F2">On June 28, 2021, the common stock of CSX Corporation split 3-for-1, resulting in the reporting person's ownership of 16,326 additional shares.</footnote>
        <footnote id="F3">This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 19, 2021.  The plan has been approved pursuant to the terms of the Issuer's policies and is part of the Reporting Person's strategy to diversify assets.</footnote>
        <footnote id="F4">On June 28, 2021, the common stock of CSX Corporation split 3-for-1, resulting in the reporting person's ownership of 5,416 additional shares.</footnote>
        <footnote id="F5">By Trustee, CSX Corporation Savings Thrift Plan.  Reflects equivalent shares of cash value held in CSX Stock Fund, which amounts will fluctuate dependent upon daily net asset value of the fund.</footnote>
        <footnote id="F6">The original exercise price of the option was $24.13.  On June 28, 2021 the common stock of CSX Corporation split 3-for-1 (the &quot;Stock Split&quot;), resulting in an adjusted price of $8.04.  The Stock split also resulted in the reporting person's ownership of 4,406 additional shares.</footnote>
        <footnote id="F7">The original exercise price of the option was $48.39.  On June 28, 2021 the common stock of CSX Corporation split 3-for-1 (the &quot;Stock Split&quot;), resulting in an adjusted price of $16.13.  The Stock split also resulted in the reporting person's ownership of 2,372 additional shares.</footnote>
        <footnote id="F8">The original exercise price of the option was $53.82.  On June 28, 2021 the common stock of CSX Corporation split 3-for-1 (the &quot;Stock Split&quot;), resulting in an adjusted price of $17.94.  The Stock split also resulted in the reporting person's ownership of 3,532 additional shares.</footnote>
        <footnote id="F9">The original exercise price of the option was $68.09.  On June 28, 2021 the common stock of CSX Corporation split 3-for-1 (the &quot;Stock Split&quot;), resulting in an adjusted price of $22.69.  The Stock split also resulted in the reporting person's ownership of 7,428 additional shares.</footnote>
        <footnote id="F10">The original exercise price of the option was $79.51.  On June 28, 2021 the common stock of CSX Corporation split 3-for-1 (the &quot;Stock Split&quot;), resulting in an adjusted price of $26.50.  The Stock split also resulted in the reporting person's ownership of 15,638 additional shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Mark D. Austin, Attorney-in-Fact</signatureName>
        <signatureDate>2021-10-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
