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Correspondence

 April 1, 2008

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

 Division of Corporation Finance

 100 F Street, N.E.

 Washington, DC 20549

 Union Pacific Corporation

 Form 10-K for the Year Ended December 31, 2007

 File No. 001-06075

 Dear Mr. Fay:

 This letter is in response to the comment letter, dated March 18, 2008, addressed to Mr. Robert M. Knight, Jr., Executive Vice President
– Finance and Chief Financial Officer of Union Pacific Corporation (the “Company”), regarding the comments of the Staff of the Securities and Exchange Commission with respect to the above-referenced Annual Report on Form 10-K for the
year ended December 31, 2007, filed on February 28, 2008 (the “Form 10-K”).

 For the convenience of the Commission
Staff, we reproduce the text of each numbered paragraph in the comment letter and follow with our responses.

 We respectfully submit the
following information and comments with respect to each comment contained in the comment letter.

 Form 10-K for the Year Ended December 31, 2007

 Governmental and Environmental Regulation, page 6

 Governmental Regulation, page 6

1.
We note that you are subject to a variety of governmental regulation. In connection with this and in view of your substantial investment in properties, please tell us whether there
are any legal obligations with respect to retirement of your properties associated with such regulation and your consideration of FAS 143 and FIN 47 in this regard.

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

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 Response:

 At December 31, 2007, we had an $18 million liability for our combined FIN 47 and FAS 143 obligations reported on our consolidated
balance sheet. No disclosure has been made in our Form 10-K related to these obligations based on our assessment of materiality. We evaluate changes in laws and contractual obligations that may arise to determine any impact on these legal
obligations, as well as any potential future obligations.

 For your reference, we have included the following disclosures related to FIN 47
and FAS 143 that were presented in our 2005 Form 10-K:

 “In March 2005, the FASB issued FASB Interpretation No. 47, Accounting
for Conditional Asset Retirement Obligations – an interpretation of FASB Statement No. 143 (FIN 47). This interpretation clarifies that the term conditional asset retirement obligations, as used in FASB Statement No. 143, refers
to a legal obligation to perform an asset retirement activity in which the timing or method of settlement, or both, are conditional on a future event that may or may not be within the control of the entity. An entity must recognize a liability for
the fair value of a conditional asset retirement obligation if the fair value of the liability can be reasonably estimated. We assessed the impact of the interpretation on our financial statements, determined that we have a legal obligation to
properly dispose of asbestos-containing materials, and recorded a $5 million liability at December 31, 2005, for the fair value of this obligation.”

 “Differences in Securities and Exchange Commission (SEC) and Surface Transportation Board (STB) Accounting – STB accounting rules require that railroads accrue the cost of removing track structure over the
expected useful life of these assets. Railroads historically used this prescribed accounting for reports filed with both the STB and SEC. In August 2001, the FASB issued Statement No. 143, Accounting for Asset Retirement Obligations (FAS
143). This statement was effective for us beginning January 1, 2003, and prohibits the accrual of removal costs unless there is a legal obligation to remove the track structure at the end of its life. We concluded that we did not have a legal
obligation to remove the track structure, and under generally accepted accounting principles we could not accrue the cost of removal in advance. As a result, reports filed with the SEC reflect the expense of removing these assets in the period in
which they are removed.”

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

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 Management’s
Discussion and Analysis, page 20

 Results of Operations, page 22

 Operating Revenue, page 22

2.
In regard to your fuel surcharge, please disclose in your next Form 10-Q the expected impact of (i) the limitations established by the STB, (ii) the new fuel surcharge
program, and (iii) the resetting of the base fuel price on the amount of related revenue recognized.

 Response:

 We note your comment and provide the following clarification to the fuel surcharge disclosure on pages 22 and 23 of our Form 10-K. The STB decision
required railroads to change their methodology for the calculation of fuel surcharges on traffic regulated by the STB from a percentage of revenue basis to a method that is linked more closely to the fuel consumption for the rail traffic to which
the fuel surcharge is applied, e.g., mileage. This decision only required a change in our underlying methodology for calculating the fuel surcharge on regulated traffic, which represents approximately 19% of our current revenue base. The decision
did not limit our ability to recover fuel surcharges to offset the effect of rising fuel costs. In response to the STB decision, we implemented our new mileage-based fuel surcharge programs in April 2007. Additionally, we reset the base fuel price
at which the new mileage-based fuel surcharges take effect. The resetting of the fuel price at which the fuel surcharge begins, in conjunction with rebasing the affected transportation rates to include a portion of what had been in the fuel
surcharge, did not materially change our revenue as higher base rates offset lower fuel surcharge revenue.

 We do not anticipate a material impact on our
results of operations, financial condition, or liquidity as a result of the STB decision, the implementation of our new mileage-based fuel surcharge programs, or resetting the base fuel price. If there are any future events or developments that
materially affect our ability to recover fuel costs, we will disclose such matters in future filings.

 Consolidated Statements of Financial Position,
page 49

3.
Please disclose any individual amounts in “other current assets” and “other current liabilities” in excess of 5% of total current assets and total current
liabilities, respectively. Refer to Rules 5-02.8 and .20 of Regulation S-X.

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

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 Response:

 We confirm that “other current assets” and “other current liabilities” do not include any individual amounts in excess
of 5% of total current assets or total current liabilities, respectively.

 Consolidated Statements of Cash Flows, page 50

4.
Please explain to us, with a view to disclosing, the basis for presenting “proceeds from completed equipment financings” as an investing rather than as a financing
activity.

 Response:

 “Proceeds from completed equipment financings” represent proceeds from the sale of productive assets in sale-leaseback transactions. Throughout the year, we fund the acquisition of groups of locomotives and freight cars and then
enter into sale-leaseback transactions with third-party lessors. The initial payment for the acquisition of these assets is shown in the investing section of the statement of cash flows as “acquisition of equipment pending financing”. In
accordance with paragraph 16(c) of FAS 95, the proceeds from the sale of these assets to third party lessors are included in investing activities. In order to clarify the investing nature of these cash flows, we will change “proceeds from
completed equipment financings” to “proceeds from sale of assets financed” in future filings.

 The resulting leases from the
sale-leaseback transactions are appropriately included in the FAS 13 disclosures throughout our Form 10-K. As the sale-leaseback transactions involve only equipment, these transactions are not in the scope of FAS 98 and, therefore, those disclosure
requirements do not apply.

 Notes to the Consolidated Financial Statements, page 52

 Note 1. Significant Accounting Policies, page 52

 Property and Depreciation, page 52

5.
 Please tell us and disclose the service life for each class of depreciable property. In connection with this, explain to us the correlation between (i) the
applicable service lives, (ii) the average age of the equipment, as disclosed on page 12, and (iii) the

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

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quotient of accumulated depreciation divided by total costs of “properties.” For example, accumulated depreciation is only 25% of the total cost of
properties at December 31, 2007, suggesting that the equipment on page 12 has a substantial remaining life despite the existing lengthy average age reported.

 Response:

 As we described in our critical accounting policies on page 43 of our Form 10-K,
the railroad industry is capital intensive, and we follow the group depreciation method. Properties are carried at cost. Provisions for depreciation are computed principally on the straight-line method based on estimated service lives of depreciable
property. The lives are calculated using a separate composite annual percentage rate for each depreciable property group, based on the results of internal depreciation studies. We are required to submit a report on depreciation studies and proposed
depreciation rates to the STB for review and approval every three years for equipment property and every six years for road property. The cost (net of salvage) of depreciable railroad property retired or replaced in the ordinary course of business
is charged to accumulated depreciation, and no gain or loss is recognized.

 The following table lists the major categories of property and
equipment, as well as the composite depreciation rate for each category, and will be included in future filings:

 Millions of Dollars, Except Percentages

2007

2006

Depreciation
Rate for
2007

 Land

$
4,627

$
4,614

N/A

 Road [a]

33,034

31,020

3.1
%

 Equipment [b]

7,308

7,196

4.3
%

 Computer hardware and software

510

441

13.5
%

 Other

175

177

N/A

 Total properties

45,654

43,448

N/A

 Accumulated depreciation

(11,496
)

(10,575
)

N/A

 Net properties

$
34,158

$
32,873

N/A

[a]
Road property consists of track and other roadway structure such as ties, rail, ballast, bridges, and signals.

[b]
Equipment property includes locomotives, freight cars, and work equipment.

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

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 The
equipment listed on page 12 of our Form 10-K includes only locomotives and freight cars (16% of total properties) not all fixed assets. In addition, the average age for locomotives and freight cars listed on page 12 represents the age from original
manufacture, not the placed into service date. Original manufacture date and the date placed into service may vary due to the purchase of previously leased equipment, the purchase of used equipment, or the rebuild of equipment that extends the
useful life of the asset allowing for a new placed into service date. Because of the difference between manufacture date and service date, there is no correlation between the average age since manufacture disclosed on page 12 and the quotient of
accumulated depreciation divided by total costs of properties. In future filings we will clarify that the average age presented is the age from manufacture for locomotives and freight cars.

6.
We note that you made capital investments totaling $3.1 billion in 2007. Please (i) quantify for us the significant components of these investments that are attributable to
“maintenance,” as you have referred to on page 12, (ii) explain to us why it is appropriate to capitalize maintenance and provide us an underlying accounting policy, (iii) explain to us with specificity how you differentiate
between repairs and maintenance that are expensed as incurred from maintenance that is capitalized, and (iv) tell us whether you capitalize any internal payroll costs as it relates to maintenance. As part of your response with regard to (iii),
if you state that maintenance that appreciably extends the life, increases the capacity, or improves the efficiency or safety of an underlying asset, please (i) explain with specificity how you measure the change and make these determinations
and (ii) provide us with examples.

 Response:

 The following responses correspond to the numbered questions in your comment.

(i)
Our 2007 capital investments included $1.6 billion that was characterized as capital maintenance on pages 12 and 33 of our Form 10-K. This amount was comprised of maintenance of way
expenditures for replacement of rail ($263 million), ties ($531 million), track surfacing ($96 million), and other related costs ($703 million). Other related costs primarily include bridges, signals, rail equipment, grade crossings and rail
grinding.

(ii)
 Our intent in using the term “maintenance” in discussing capital expenditures with the investment community is a plain English meaning and not a technical
accounting meaning. In this context, capital expenditures for maintenance primarily mean the replacement of existing track, facilities and equipment. In this replacement process,

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

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the railroad infrastructure is actually improved, e.g., replacing lighter density rail with heavier density rail, or replacing wood ties with concrete ties.
This maintenance is capitalized under generally accepted accounting principles because it extends the life, increases the capacity or improves the safety or efficiency of our fixed assets. Our intent was to provide the reader with the business
understanding of where our capital spending was being focused, e.g., maintaining the current infrastructure or adding operating capacity. We will revise our future filings to more clearly describe our capital expenditures for maintenance.

 We apply generally accepted accounting principles to determine which expenditures qualify as capital investments. In
general, substantial expenditures that increase the capacity, improve the safety or efficiency, or extend the useful life of an asset are capitalized. Expenditures that do not increase capacity, improve safety or efficiency, extend the useful life,
or are insignificant are expensed. For example, when we replace 1,320 feet (1/4 mile) or more of continuous rail or replace more than 250 cross ties per mile we recognize a capital asset. These levels of asset additions extend the useful life and
improve safety and operating efficiency and therefore qualify as capital assets.

(iii)
Expenditures must meet the requirements described in (ii) above to qualify for capitalization. If a track project meets these requirements, the cost is capitalized; otherwise,
it is treated as operating expense.

(iv)
Internal payroll costs are capitalized if the costs are associated with a qualifying capital project. In future filings we will include the following disclosure on self-constructed
assets:

 We self-construct portions of track structure and rebuild certain classes of equipment. In addition to direct labor
and material, certain indirect costs are capitalized.

7.
If not included as part of your response to the preceding comment, please explain to us how you determine what constitutes (i) an “improve[ment]” of track
infrastructure, as discussed on page 33, and (ii) an “upgrade” to your locomotive and freight car fleet when it does not constitute a purchase of additional locomotives or freight cars, as also discussed on page 33.

 Michael Fay, Branch Chief

 U.S. Securities and Exchange Commission

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 Response:

 The following responses correspond to the numbered questi