CSX vs UNP: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. CSX and UNP share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined CSX and UNP exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

CSX Corporation, headquartered in Jacksonville, Florida, operates CSX Transportation, a Class I freight railroad spanning roughly 20,000 route miles across 26 eastern U.S. states, the District of Columbia, and two Canadian provinces. The network connects Atlantic and Gulf ports, population centers, and industrial regions, hauling three broad categories of freight: merchandise (chemicals, agriculture, metals, minerals, forest products, automotive, and food and consumer goods), intermodal containers moved in partnership with trucking and shipping lines, and coal (both domestic thermal and export metallurgical). Revenue comes from freight rates negotiated with shippers, fuel surcharges tied to diesel prices, and ancillary services, with the economics driven by network density and precision scheduled railroading that maximizes asset utilization.

Full CSX guide

Union Pacific Corporation, headquartered in Omaha, Nebraska, operates the Union Pacific Railroad, which spans more than 30,000 route miles across 23 western U.S. states. The railroad hauls a diversified mix of freight including bulk commodities (coal, grain, fertilizers), industrial products, chemicals, automotive goods, and intermodal containers, connecting U.S. manufacturers, farmers, and ports to domestic and global markets. Revenue is generated through freight rates negotiated with shippers, fuel surcharge mechanisms tied to diesel prices, and ancillary services. The company's precision scheduled railroading (PSR) model focuses on maximizing asset utilization, train length, and velocity while minimizing cost per unit, which has driven sustained operating ratio improvement.

Full UNP guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• CSX drivers: Margin and Service Recovery; Intermodal and Pricing Momentum.
• UNP drivers: Pricing Power and Volume Momentum; Operational Efficiency and PSR Upside.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: CSX carries the cyclical risk common to all railroads: freight volumes track industrial production, consumer goods flows, and export demand, so a macroeconomic slowdown would pressure carloads and revenue directly. For UNP, the most immediate risk is regulatory: the Surface Transportation Board's review of the Norfolk Southern merger is drawing active opposition from competitor CSX, which is mobilizing shippers and communities, and UNP has indicated it may walk away if approval conditions exceed a reported $750 million cost threshold, which could also trigger a large breakup fee.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick CSX if you believe its drivers more; UNP if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the CSX and UNP guides.

CSX. CSX trades at a mid-20s price-to-earnings multiple, roughly in line with its Class I railroad peers, reflecting a high-quality but slow-growing network asset. The valuation embeds both the ongoing margin-recovery story and a premium for the scarcity and regulatory-barrier value of an eastern rail franchise amid industry consolidation. Figures are approximate and move with quarterly results and share price.

UNP. At roughly 21x trailing earnings, UNP trades near its own 3-year and 5-year historical average P/E, suggesting the market is pricing in steady but not exceptional growth rather than a valuation premium. The ~29% net profit margin (net income of $7.1 billion on $24.5 billion in revenue for 2025) reflects the structural cost advantages of the U.S. Class I railroad oligopoly and the efficiency gains from PSR. The pending Norfolk Southern merger introduces both meaningful upside (synergies of at least $2 billion in incremental net revenue projected) and execution and regulatory risk that investors are still digesting.

Headline figures (approximate, July 2026): CSX shows revenue (ttm) ~$14.1 billion, q1 2026 revenue ~$3.48 billion (+2% YoY), q1 2026 operating income ~$1.25 billion (+20% YoY), q1 2026 eps (diluted) ~$0.43 (+26% YoY); UNP shows revenue (full-year 2025) ~$24.5 billion, net income (full-year 2025) ~$7.1 billion, eps diluted (full-year 2025) ~$11.98, adjusted operating ratio (full-year 2025) ~59.3%.

CSX and UNP are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined CSX and UNP exposure against your real portfolio. It is not an investment adviser.