the beijing–kowloon through train () is an intercity railway service between hung hom station (formerly kowloon station until 1998) in hong kong and the beijing west railway station, jointly operated by the mtr of hong kong and china railway, china's national rail service. the train runs to beijing and hong kong every other day. services use the east rail line in hong kong, cross the boundary between hong kong and mainland china at lo wu and then continue along china's railway network via the guangshen railway and the jingguang railway to beijing. total journey time is approximately 23 hours, and the train uses 25t class train carriages.