With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Roger Federer won against Andre Agassi at the US Open.
text_B: Ratchaphruk Express was a special overnight train operated by SRT .. SRT. State Railway of Thailand. It ran from Bangkok to the northern city of Chiang Mai , daily , between November 1 , 2006 to January 31 , 2007 to serve Royal Flora Festival or Ratchaphruk 2006 .. Bangkok. Bangkok. Chiang Mai. Chiang Mai. Royal Flora Festival. Royal Flora Ratchaphruek. The northbound train No. 963 would depart from Bangkok Station at 5 :45 pm to arrive in Chiang Mai Station at 7 :05 am .. Bangkok. Bangkok. Chiang Mai. Chiang Mai. Bangkok Station. Hualamphong. Chiang Mai Station. Chiang Mai Station. The southbound train No. 964 would depart from Chiang Mai Station at 10 :00 pm to arrive to Bangkok Station at 11 :20 am .. Bangkok. Bangkok. Chiang Mai. Chiang Mai. Bangkok Station. Hualamphong. Chiang Mai Station. Chiang Mai Station. Category  : Passenger rail transport in Thailand
not_related.