With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Jackson family included people born in the 20th century.
text_B: A-train is Hitachi 's brand name for rail rolling stock built and designed using a set of technologies including car-bodies manufactured from friction stir welded double skin aluminium extrusions with built-in mounting rails for sub-assemblies , and self-modular construction using supporting sub-modules .. Hitachi. Hitachi. The stock is designed to facilitate a number of product life-cycle improvements including ease of manufacture , increase in energy efficiency , and recyclability .
not_related.