KTT (simplified Chinese: 九广通; traditional Chinese: 九廣通)[4] was a push-pull train set used by the MTR Corporation Limited in Hong Kong on the Guangdong Through Train route.

It was used on the Guangdong line (Hung Hom (Kowloon), Hong Kong - Changping - Guangzhou East) of the through train service.

The double-deck "KTT" trailers have bottom floors which are lower than ordinary cars serving on the same pair of tracks.

On 31 July 2024, the General Administration of Customs announced that in June 2024, the State Council had approved the closure of all four railway ports of the inter-city through trains, effective from the date of notice, citing that high-speed passenger trains have effectively met the travel needs of passengers between the mainland and Hong Kong.

Since March 2018, all KTT coaches have undergone minor refurbishments.