Jennifer Hamann
Executive Vice President and Chief Financial Officer at Union Pacific
Thanks Eric, and good morning. Let me start with a look at the first quarter operating ratio and earnings per share on Slide 13. As you heard from Lance, Union Pacific is reporting first quarter earnings per share of $2.57 and a quarterly operating ratio of 59.4% 70 basis points of improvement. Comparing year-over-year first quarter results you'll recall that Winter Storm Uri significantly impacted 2021. So in 2022, we have the positive effect to our operating ratio of 160 basis points and $0.16 earnings per share. Rising fuel prices throughout the quarter the lag on our fuel surcharge programs, and widening spreads between WTI and highway diesel fuel prices negatively impacted our quarterly ratio by 80 basis point while adding $0.12 per share.
Core results were a 10 basis point drag to the operating ratio, but contributed $0.29 to EPS. These core results are indicative of both operational inefficiencies in the quarter, as well as the strong top line growth we delivered. Looking now at our first quarter income statement on Slide 14, operating revenue totaled $5.9 billion, up 17% versus 2021 on 4% year-over-year volume growth. Operating expense increased 16% to $3.5 billion, excluding the impact of higher fuel prices expenses were up 7% in the quarter.
First quarter operating income was a record at $2.4 billion, a 19% increase versus last year. Adjusted for fuel price first quarter incremental margins totaled 56%. Expectations for full year incrementals are unchanged in the mid-60s, which is the lower end of our Investor Day guidance. Interest expense increased 6% compared to 2021, reflecting increased debt levels, partially offset by a lower effective interest rate. Income taxes increased 18% due to higher pre-tax income partially offset by a lower effective tax rate. We now estimate the full-year effective tax rate to be around 23.5% as several states have lowered or are expected to lower rates.
Net income of $1.6 billion increased 22% versus 2021, which when combined with share repurchases resulted in earnings per share up 29% to $2.57. Looking more closely at first quarter revenue, slide 15, provides a breakdown of our freight revenue, which totaled $5.4 billion, up 17% versus 2021. Broad-based volume growth supported by successful business development efforts as Kenny discussed contributed 425 basis points. Fuel surcharge revenue of $635 million increased freight revenue of 800 basis point, as the higher surcharge revenue reflects the significant surge in diesel fuel prices. The robust demand environment continues to support actions that yield price dollars that exceed inflation dollars. These gains, combined with the positive business mix to drive 475 basis points of freight revenue growth. Lower intermodal volume combined with higher industrial shipments drove the positive mix.
Now let's move on to Slide 16, which provides a summary of our first quarter operating expense. As noted earlier, the primary driver of the increased expense was fuel up 17% on a 59% increase in fuel prices and 9% higher gross ton-miles. Our fuel consumption rate was relatively flat compared to 2021, as a favorable business mix was offset by negative productivity. Looking further at the expense lines, compensation and benefits expense was up 7% versus 2021. First quarter workforce levels increased 1% as a 2% increase in our train and engine crews were partially offset by flat management, engineering and mechanical workforces.
As you heard from Eric, we continue to hire into our transportation craft to support network recovery efforts and prepare for future growth. Cost per employee increased 6% as a result of wage inflation, as well as higher recruit over time and borrow out costs related to network inefficiencies, partially offset by last year's weather-related expenses. Given the current operational challenges, we now expect cost per employee to remain elevated into the second quarter. Purchased services and material expense was up 14% driven by inflation, higher volume related purchase transportation expense associated with our loop subsidiary and cost to maintain a lot for active locomotive fleet. Equipment and other rents was up 1% driven by lower TTX equity income. Other expense increased 5% in the quarter driven by higher state and local taxes and increased business travel.
Turning to Slide 17, and our cash flows, cash from operations in the first quarter increased to $2.2 billion from $2 billion in 2021, a 14% increase. Our cash conversion rate was 85% and free cash flow of $657 million declined $146 million. This includes $312 million of increased cash capital spending and $93 million in higher dividends. The cash capital investment reflects both payments from elevated fourth quarter spending, as well as a normalized start to our 2022 program. In the quarter, we returned $3.5 billion to shareholders through dividends and share repurchases. This includes the $2.2 billion accelerated share repurchase program executed in February, and we finished the first quarter with an adjusted debt-to-EBITDA ratio of 2.8 times, as we continue to maintain a strong investment-grade credit rating.
Wrapping up on Slide 18, I want to start by recognizing that several things have changed since we provided guidance in January from fuel prices to our operational performance. As we sit here today, those pressures make achievement of around a 55.5% operating ratio unlikely. However, assuming some stabilization in fuel and recovery in our service product we'll still look to achieve our long-term goal of an OR that starts with a 55% this year. Importantly, we are affirming our previously provided 2022 targets for volume, price and incremental margin.
Our cash and capital plans also are unchanged. Capital spending remains at $3.3 billion for the year well within our long-term guidance of below 15% of revenue, and we remain committed to an industry-leading dividend payout ratio and share repurchases in line with 2021. Before I turn it back to Lance, I'd like to express my appreciation to the Union Pacific team. Working in an outdoor factory is always a challenge, but especially so during winter. Our employees though are undeterred and their desire to safely serve our customers while delivering another quarter of solid financial results. Thank you. With that, I'll turn it back to Lance.