Shares of CSX (CSX) - Get CSX Corporation Report have fallen from session highs, but are still up by about 0.5% Tuesday after analysts at Deutsche Bank upgraded the stock to buy from hold. The analysts also assigned a price target of $56. 

This stock is defying gravity, now up more than 100% over the past year, TheStreet's Jim Cramer, manager of the Action Alerts PLUS portfolio, said on CNBC's "Stop Trading" segment. 

Enough is enough, Cramer reasoned. While he really likes the rail stocks, these are not hyper-growth companies. 

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CSX CEO Michael Ward is a set to retire May 31. Analysts didn't take issue with Ward, because he was a very good operator, Cramer explained. He is skeptical that the next person at the helm will really be that much better to justify such a steep rally in the stock. 

At a certain point, investors need to remember that CSX is just a railroad, he concluded. 

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At the time of publication, Cramer's Action Alerts PLUS had no position in companies mentioned.