Germany's Siemens Aktiengesellschaft and France's Alstom SA offered to sell either of the companies' high-speed train technology in response to antitrust concerns over their proposed deal, people familiar with the matter told Reuters.

Under the proposal, Siemens' Velaro Novo platform or Alstom's Pendolino platform would be divested, the sources said. The proposal includes a five-year license to sell the trains in Europe.

The companies' offer also includes selling three-quarters of Alstom's signaling business in Europe in addition to some Siemens signaling assets, one of the sources said.

Regulators are examining the potential combination of Siemens' mobility business, including its rail traction drives business, with Alstom. The European Commission gave rivals and customers this week to provide feedback on the companies' commitments. A negative response may result in the regulatory body demanding more concessions before it makes a decision by Feb. 18, 2019, according to Reuters.