-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 2CQX1mnYBrGq0qMnqdpgLQ==

<SEC-DOCUMENT>0001221662-06-000016.txt : 20060222
<SEC-HEADER>0001221662-06-000016.hdr.sgml : 20060222
<ACCEPTANCE-DATETIME>20060222175058
ACCESSION NUMBER:		0001221662-06-000016
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060217
FILED AS OF DATE:		20060222
DATE AS OF CHANGE:		20060222

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			UNION PACIFIC CORP
		CENTRAL INDEX KEY:			0000100885
		STANDARD INDUSTRIAL CLASSIFICATION:	RAILROADS, LINE-HAUL OPERATING [4011]
		IRS NUMBER:				132626465
		STATE OF INCORPORATION:			UT
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1400 DOUGLAS STREET
		STREET 2:		STOP 0310
		CITY:			OMAHA
		STATE:			NE
		ZIP:			68179
		BUSINESS PHONE:		402 544 5214

	MAIL ADDRESS:	
		STREET 1:		1400 DOUGLAS STREET
		STREET 2:		STOP 0310
		CITY:			OMAHA
		STATE:			NE
		ZIP:			68179

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ANSCHUTZ PHILIP F
		CENTRAL INDEX KEY:			0000944423
		STATE OF INCORPORATION:			CO
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-06075
		FILM NUMBER:		06637150

	BUSINESS ADDRESS:	
		STREET 1:		C/O ANSCHUTZ CO
		STREET 2:		555 SEVENTEENTH ST STE 2400
		CITY:			DENVER
		STATE:			CO
		ZIP:			80202
		BUSINESS PHONE:		3032981000

	MAIL ADDRESS:	
		STREET 1:		2400 ANACONDA TOWER 555 SEVENTEENTH ST
		STREET 2:		C/O ANSCHUTZ CO STE 2400
		CITY:			DENVER
		STATE:			CO
		ZIP:			80202
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-02-17</periodOfReport>

    <issuer>
        <issuerCik>0000100885</issuerCik>
        <issuerName>UNION PACIFIC CORP</issuerName>
        <issuerTradingSymbol>UNP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000944423</rptOwnerCik>
            <rptOwnerName>ANSCHUTZ PHILIP F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>555 SEVENTEENTH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DENVER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80202</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Contract</value>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-02-17</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>0</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By The Anschutz Corporation</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On February 17, 2006, The Anschutz Corporation entered into a forward sale contract (the &quot;Contract&quot;)  that relates to an aggregate of 250,000 shares of common stock (the &quot;Base Amount&quot;).  The Contract provides that The Anschutz Corporation will deliver on one settlement cycle following August 2, 2010 (the &quot;Settlement Date&quot;) a number of shares of common stock equal to (i) the applicable Base Amount, and (ii) the applicable Exchange Rate, which will be determined as follows:</footnote>
        <footnote id="F2">(a) If the closing price (the &quot;Settlement Price&quot;) of the common stock on August 2, 2010 is less than or equal to $86.5497 (the &quot;Forward Floor Price&quot;), the Exchange Rate will be one; (b) If the Settlement Price is greater than the Forward Floor Price but less than or equal to $121.1696 (the &quot;Forward Cap Price&quot;), the Exchange Rate will be equal to the Forward Floor Price divided by the Settlement Price;  and (c) If the Settlement Price is greater than the Forward Cap Price, the Exchange Rate will be equal to the Adjusted Forward Floor Price (as hereinafter defined) divided by the Settlement Price.  The Adjusted Forward Floor Price will be equal to the Forward Floor Price plus the Settlement Price minus the Forward Cap Price.</footnote>
        <footnote id="F3">In consideration therefor, The Anschutz Corporation will receive on February 23, 2006 an aggregate prepayment amount of $16,476,900.  In the event of the payment of dividends (whether cash or in-kind), stock splits, reverse stock splits, spinoffs, mergers or similar events affecting the common stock, the Base Amount and one or more of the Settlement Price, Forward Floor Price and Forward Cap Price are subject to adjustment depending on the nature of the transaction.  The Anschutz Corporation has pledged 250,000 shares of common stock to secure its obligations under the Contract.</footnote>
        <footnote id="F4">Philip F. Anschutz owns 100% of the capital stock of Anschutz Company, which owns 100% of the capital stock of The Anschutz Corporation.  The Anschutz Corporation is the registered owner of the securities indicated.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Thomas A. Richardson, Attorney in Fact</signatureName>
        <signatureDate>2006-02-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
