German industrial conglomerate Siemens AG is in talks to combine its rail unit with Canada-based Bombardier Inc.'s train business, people familiar with the matter said.

The talks between two of the world's largest train makers are at an early stage and a deal is far from guaranteed, the people said. Bombardier is also talking to other possible partners, two of these people said.

Bombardier is simultaneously preparing to float a minority stake of its transportation unit, which is based in Berlin, on the Frankfurt Stock Exchange this fall to strengthen its balance sheet.

"There is little specificity around Bombardier's plans to float the minority stake in its rail business in Germany later this year, but there are two issues at play. One is cash … [and the] other is consolidation, since the creation of a Chinese powerhouse through the merger of CSR Corp. and China CNR makes the landscape more challenging and elevates the importance of scale," J.P. Morgan analysts said in a recent note. The analysts put a price tag of $5.1 billion on Bombardier's train unit.

Based on revenues, Siemens' train unit is about one-third smaller than Bombardier's. The Canadian firm's transportation business posted revenue of $9.6 billion last year while Siemens's mobility division, which includes its rail businesses, reported revenue of €7.2 billion ($8 billion) during the same period. Siemens's rail business comprises about 85% of its mobility division, according to a calculation by an analyst at J.P. Morgan.

Munich-based Siemens is slated to announce third-quarter earnings on Thursday. Analysts expect the company to report weak earnings, with net profit down 23%, according to a recent poll by The Wall Street Journal. It isn't clear whether Siemens will address the rail negotiations with Bombardier at the earnings conference.

In May, Bombardier Chief Executive Alain Bellemare said he was considering either a joint venture or partial sale of the rail unit, in addition to a minority spin off, but dismissed speculation that the entire rail business was for sale.

Siemens could potentially merge its train operations with Bombardier's after the partial flotation, another person familiar with the matter said.

The potential tie-up closely follows a tough second quarter for Siemens, which has been weighed down by low global oil prices and an economic slowdown in China. Analysts at J.P. Morgan expect a 6% drop in orders, driven by declines at the energy and automated-drives divisions.

At the same time, Siemens's mobility unit is expected to report 20% growth in orders, as a result of large orders in Finland and Qatar, as well as a services order from Russia, according to J.P. Morgan.

The talks between Siemens and Bombardier are taking place against the backdrop of consolidation in the global rail industry. China's two state-owned train makers, CSR Corp. and China CNR Corp.—the world's largest locomotive manufacturers—merged last month to become CRRC Corp. Just before the merger, the two companies had a total market capitalization of around $127 billion, according to S&P Capital IQ.

Earlier this year, the two government-controlled entities considered a bid for Bombardier's train assets in an effort to further increase their global presence, according to people familiar with the matter. But CRRC said in late June that it had no plans to buy Bombardier's train business.

Asia is the world's largest market for trains, with rolling-stock sales averaging €28.4 billion over the past three years, compared with €21.9 billion in Europe and €16.8 billion in North America, according to rail consultancy SCI Verkehr.

Asian and West European train markets will grow the most in coming years, SCI predicts.

In an effort to better serve their home market, both CSR and CNC have been making trains through joint ventures with Western companies, including Siemens, Bombardier, General Electric Co. and Alstom SA, according to Maria Leenan, chief executive at SCI.

GE, which is in the process of buying Alstom's energy business, last year opted not to acquire the French industrial group's rail division when the two companies negotiated a takeover by GE.

Siemens, which also bid for Alstom's energy operations last year, at the time offered to trade its rail division to Alstom as part of any future deal. Alstom rejected that offer but a Siemens-Alstom train tie-up remains a possibility for both European companies, analysts say, despite the GE-Alstom deal.

Ms. Leenan of SCI said consolidation among European train makers would allow manufacturers to recoup high development expenses through higher sales volumes.

"It remains to be seen if the train makers merge or if they move closer through cooperation, in which the companies specialize in train parts which they supply to each other," she said.

Friedrich Geiger and Archibald Preuschat contributed to this article.

Write to Eyk Henning at eyk.henning@wsj.com and Christopher Alessi at christopher.alessi@wsj.com

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