G-series high-speed trains (China Railway High-speed) operate between Hong Kong West Kowloon and Guangzhou South on the Guangzhou–Shenzhen–Hong Kong Express Rail Link. These G trains typically run at 200–300 km/h (124–186 mph) on the corridor and cover the roughly 140–150 km distance in about 47–65 minutes, depending on whether the service is non-stop or calls at intermediate stations. Rolling stock on this route is high-speed CRH/EMU equipment offering Second (Standard) and First Class seating; many services also provide Business Class on selected trains. West Kowloon features mainland immigration co-location facilities, so passengers usually clear Mainland immigration and customs before boarding. - Conventional intercity / Through Train services (historic Hung Hom ↔ Guangzhou East routes) use conventional EMU or locomotive-hauled stock and operate at up to about 160 km/h (99 mph). These slower services, where available, take around 2 to 2.5 hours and have fewer daily departures compared with the high-speed link. Onboard seating is typically standard and first-class arrangements rather than dedicated high-speed classes; station-based immigration procedures can differ from the West Kowloon co-location arrangement. Overall: G-series high-speed trains provide the shortest travel time and high frequency between West Kowloon and Guangzhou South (47–65 minutes). Conventional through-train options, when running, offer a slower alternative (approximately 2+ hours) with reduced frequency and different station/immigration logistics.