The Adtranz-CAF EMU (also known as A-Train, CAF-Train or LAR-Train) is an electric multiple unit (EMU) train that operates on the MTR rapid transit railway system in Hong Kong.

There are two variants, one used on the conventional Tung Chung line, and a more luxurious version used on the Airport Express.

These two variations are built jointly by Adtranz (acquired by Bombardier Transportation in 2001) and Construcciones y Auxiliar de Ferrocarriles (CAF)[3] and manufactured in Spain in 1996-7.

On 21 November 1994, the joint venture of AEG Schienenfahrzeuge GmbH (later Adtranz) and Construcciones y Auxiliar de Ferrocarriles was awarded the contract to build the rolling stock for the Lantau Airport Railway under Contract 551.

They were built and assembled by CAF in Spain while Adtranz contributed control and traction equipment.