Exhibit 31(a)
CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
I, James R. Young, certify that:
| 1. | I have reviewed this quarterly report on Form 10-Q/A of Union Pacific Corporation; and |
| 2. | Based on my knowledge, this report does not contain any untrue statement of material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Date: July 31, 2008
/s/ James R. Young |
James R. Young |
Chairman, President and |
Chief Executive Officer |