中国铁建
In May 2019, by request of the Prime Minister, Hun Sen, a team from China Railway Construction Corporation arrived in Cambodia to conduct feasibility studies on railway upgrades, including bridge and track repairs, double tracking, electrification, Siem Reap – Phnom Penh (via Battambang and Pursat) high-speed railway corridor, Koh Kong - Sihanoukville (via Botum Sakor and Sre Ambel) high-speed railway corridor and light rail system construction in Phnom Penh.