Rail merger: capital still weighs on these stocks

2026-09-21 · By Lubin Danilo, founder of Lubin Investment

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Union Pacific wants to buy Norfolk Southern to build America's first transcontinental freight railroad. But Canadian Pacific, already merged with Kansas City Southern in 2023, shows that getting bigger fixed nothing: its debt relative to cash is the heaviest and its cash return on capital the weakest of the five companies in this ranking.

Why railroads have the reputation of the perfect compounder

Building a continent-scale freight rail network is essentially impossible today: you would need to buy tens of thousands of miles of land, secure right-of-way against private owners and municipalities, and convince regulators who have not approved a major new network in a century. Investors call this wall of entry a moat, a defensive trench that protects a business from competition. That is largely what pushed Warren Buffett to buy all of BNSF outright in 2010: an asset that can no longer be rebuilt, serving customers who often have no alternative for moving coal, grain, or containers over long distances.

That reputation of an unbreakable fortress sticks to the whole sector. On paper, the numbers back it up: the five largest North American freight railroads post net margins ranging from 21% to 29%, a level many industrial companies never reach. The problem, as we will see, is that my quality filter looks at something other than net margin.

Five North American giants, one filter: the full ranking

I ran the five largest publicly traded North American freight railroads through my ten financial criteria: profitability, sales and cash growth, buybacks, margin expansion, cash return on capital, debt. Here is the result, figures individually verified at the time of writing.

None of the five scores above 5 out of 10. None triggers my strict buy signal, which also requires the current price to sit near its lowest levels of the past five years. A sector known for quality, and yet a clear ceiling on my score.

A net margin of 20% to 29% is excellent. Why is the score so low?

Net margin measures what is left of revenue once every accounting charge is deducted, depreciation included. It is strong across this ranking. But depreciation is an accounting charge, not a real cash outflow: it spreads an investment already paid for over several years. The real test I run on every company is the cash that actually leaves the till each year to keep the network running: replacing worn-out rails, reinforcing bridges, modernizing rail yards, buying new locomotives. That spending is called maintenance capex, and for a rail network it is enormous and never ending, unlike a software company that has almost no physical assets to maintain.

That gap between accounting profit and the cash truly left over after upkeep is exactly what explains the wide spread in this ranking: a flattering net margin that hides a far thinner pool of usable cash once the network has been maintained.

Cash return on capital, the number that gives away rail's real cost

Cash return on capital employed, what I call cash ROCE, divides that leftover cash after upkeep by the total capital tied up in the business, land, track, and rolling stock included. I require more than 15% a year. Here it caps out at 9.7% for Union Pacific, the best of the group on this metric, and drops to 3.3% for Canadian Pacific Kansas City. In plain terms: for every 100 dollars tied up in the network, Union Pacific turns just under 10 back into usable cash each year, and Canadian Pacific barely more than 3.

The image that helps here is a landlord whose building constantly needs expensive renovation, roof, plumbing, facade, just to keep renting it out at the same price. The rent collected looks comfortable on paper, but once the yearly repair bill is paid, what is left in the landlord's pocket is far more modest. That is exactly the position of a rail network: owning the infrastructure imposes never ending upkeep, even when the volume of freight moved stalls.

Why do these companies carry so much debt relative to their cash?

I also look at how many years of current cash it would take each company to fully repay its net debt. I require under 3 years. Here the gap runs from 4.5 years for Union Pacific to 12 years for Canadian Pacific Kansas City, the most indebted of the group, which would need twelve years of its current cash just to become debt free. That is not necessarily reckless: when cash return on capital is this low, borrowing to fund network upkeep or buybacks is often cheaper than draining an already tight cash flow. But it also means these companies have very little room to maneuver if interest rates rise or freight volumes slow sharply.

Is Canadian Pacific's 19.7% growth actually organic?

At first glance, Canadian Pacific Kansas City shows the group's best sales growth, 19.7% a year over five years, far ahead of the others, which cap out between -0.3% and 1.3%. But that number is misleading: it comes almost entirely from the merger with Kansas City Southern, completed in 2023, which created the first rail network directly connecting Canada, the United States, and Mexico. A merger mechanically adds the entire revenue of the absorbed company, inflating measured growth without a single extra customer won on the ground that same year. That is growth by acquisition, not organic growth, and the two do not read the same way.

Outside that merger effect, the sector is essentially flat: between -0.3% and +1.3% a year for the other four, a pace that reflects structurally mature freight rail traffic in the United States and Canada, weighed down by a decade of declining coal volumes. That does not mean activity is weak everywhere: Union Pacific, for instance, posted its best first-quarter grain volume since 2008 in early 2026, driven by export demand, and CSX saw intermodal volumes rise 6% year over year in the first quarter of 2026, as shippers turned to rail amid rising trucking fuel costs. But these solid operating signals have not, so far, moved the five-year average growth rate or the cash return on capital.

Is rail about to get bigger? The Union Pacific, Norfolk Southern megamerger

On July 28, 2025, Union Pacific and Norfolk Southern signed a merger agreement that would create the first genuinely transcontinental U.S. freight railroad, linking the East and West coasts under a single operator for the first time. Each Norfolk Southern share would convert into one Union Pacific share plus 88.82 dollars in cash, for a total of roughly 225 million new shares and 20 billion dollars in cash. The U.S. rail regulator, the Surface Transportation Board, accepted the application as complete on May 28, 2026, and Union Pacific and Norfolk Southern strengthened their filing in late July 2026 with new customer protections, ahead of a procedural schedule running through February 2027, with a decision expected sometime in 2027.

The question I care about most is not whether this merger will happen, but whether it fixes the sector's real problem, the one this ranking exposes: a structurally weak cash return on capital. On that point, Canadian Pacific Kansas City is the closest test case we already have, since its merger with Kansas City Southern has been completed since 2023. The result is not encouraging: Canadian Pacific Kansas City now posts the weakest cash return on capital in the group, 3.3%, and the heaviest debt relative to cash, 12 years. Getting bigger added revenue and a wider network, but nothing suggests it solved the real problem: a bigger network is still a network that needs proportionally bigger perpetual upkeep. One case proves nothing definitive, but it is a signal worth watching closely if the Union Pacific, Norfolk Southern merger goes through.

Does price follow the same slope as quality?

For each company, my model calculates a reasonable buy price from the cash it should generate over the next five years, then compares that price to the current share price. All five companies in this ranking trade above that price today, from 21.9% too expensive for Canadian Pacific Kansas City to 92.1% too expensive for CSX. None triggers my opportunity signal, which also requires a price near its five-year lows.

CSX's gap deserves a word of explanation, because it looks enormous for a multiple of 47.1 times annual cash, already high but not extreme on its own. The reason is that CSX's cash generated per share has declined 5.7% a year over five years: my model projects that cash forward five years from its recent trend, and a deteriorating trend pushes the target price much lower. A multiple that looks reasonable at a glance can therefore still be expensive if the cash it is measured against is itself shrinking.

What this ranking teaches beyond rail

What holds for rail holds for any business that owns heavy physical infrastructure: power grids, pipelines, toll roads, telecom towers. Accounting net margin can stay flattering for years while the real return on capital, once perpetual upkeep is deducted, is mediocre. That is exactly why my method never stops at a single number: it cross checks profitability, growth, cash return on capital, and debt, and I detail the full grid on my methodology page.

I built my analysis tool to run this filter in seconds on any stock, instead of redoing this calculation by hand every time a well reputed sector catches my eye. You can check the full profile of Union Pacific, CSX, Norfolk Southern, Canadian Pacific Kansas City, or Canadian National, and for another angle on this same sector, my comparison between Wabtec and the rail operators shows why the equipment supplier fares better than the companies that own the rails.

FAQ

Is rail a bad sector to invest in?

Not necessarily bad, but a sector where a reputation for quality, built on high net margins, is not enough on its own. You need to check cash return on capital and debt relative to cash before concluding, two criteria net margin alone does not show.

What is cash return on capital (cash ROCE), in one sentence?

The cash actually generated each year, after paying for upkeep and asset renewal, divided by the total capital invested in the business, land and equipment included.

Will the Union Pacific, Norfolk Southern merger improve their cash return on capital?

Nothing guarantees it. The precedent of Canadian Pacific, merged with Kansas City Southern since 2023, shows the opposite: the weakest cash return on capital and the heaviest debt of the five companies in this ranking.

Why does Canadian Pacific Kansas City show 19.7% growth when the others are flat?

That figure comes almost entirely from its 2023 merger with Kansas City Southern, which mechanically adds the entire revenue of the absorbed company. That is growth by acquisition, not organic growth.

Related reading

• Railroad Stocks: Which One Actually Wins the Sector?
• Cash ROCE: does reinvested capital create value?
• Is a Stock Expensive? Compare It to Itself

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About the author

Written by Lubin Danilo, founder of Lubin Investment. A self-taught individual investor, I find fundamental analysis fascinating, and it has delivered excellent results. For three years now, my performance has beaten the S&P 500. But analyzing every stock took too much time: sites with incomplete data, calculation methods and criteria never aligned with mine. And spotting the best stocks was just as time-consuming, even with my own well-defined checklist. So I put my software development background to work to build this software, base my investment strategy on its results, and share it with people who share the same passion as me. It judges a company's quality and its price separately, using criteria drawn from the financial literature (Warren Buffett, Michael Mauboussin, Aswath Damodaran).