The railways were partially rehabilitated by the Government of Cambodia, with funding from the Asian Development Bank, Australian Agency for International Development (AusAID) and Australian company Toll Holdings, operated under the name Toll Royal Railways and to complete a missing link in the Trans-Asian Railway.
The first line to be reopened as part of this project was the 117 km (73 mi) section between Phnom Penh and Touk Meas in October 2010.
The complete Southern line to Sihanoukville Port opened for freight traffic in January 2013, some 18 months behind schedule.

Toll Holdings divested their stake in 2014, with the company renamed Royal Railway Cambodia.

A new railway connecting Phnom Penh to Ho Chi Minh City is in planning, which would complete the rail link from Singapore to Kunming.

China Railway Group is planning to build a 405 km (252 mi) north–south railway across Cambodia, which would support planned expansion of the steel industry in Cambodia.

Scheduled passenger train services between Phnom Penh and Sihanoukville have resumed in May 2016 after having been suspended for 14 years.
The line between the Thai border at Poipet and Battambang was under reconstruction as of 2017, with the remainder of the line between Battambang and Phnom Penh planned to be reconstructed at a cost of $150 million.

In April 2018, trains operated by Royal Railway began running express from Phnom Penh International Airport to Phnom Penh railway station.
As of 2019, Royal Railway runs 44 trains each day, and 15–16 freight trains to Sihanoukville and Poipet.

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, Siem Reap - Phnom Penh - Doun Kaev - Kampot high-speed service, and rapid transit construction in Phnom Penh.
The railways were partially rehabilitated by the Government of Cambodia, with funding from the Asian Development Bank, Australian Agency for International Development (AusAID) and Australian company Toll Holdings, operated under the name Toll Royal Railways and to complete a missing link in the Trans-Asian Railway. The first line to be reopened as part of this project was the 117 km (73 mi) section between Phnom Penh and Touk Meas in October 2010. The complete Southern line to Sihanoukville Port opened for freight traffic in January 2013, some 18 months behind schedule.
Toll Holdings divested their stake in 2014, with the company renamed Royal Railway Cambodia.
A new railway connecting Phnom Penh to Ho Chi Minh City is in planning, which would complete the rail link from Singapore to Kunming.
China Railway Group is planning to build a 405 km (252 mi) north–south railway across Cambodia, which would support planned expansion of the steel industry in Cambodia.
Scheduled passenger train services between Phnom Penh and Sihanoukville have resumed in May 2016 after having been suspended for 14 years. The line between the Thai border at Poipet and Battambang was under reconstruction as of 2017, with the remainder of the line between Battambang and Phnom Penh planned to be reconstructed at a cost of $150 million.
In April 2018, trains operated by Royal Railway began running express from Phnom Penh International Airport to Phnom Penh railway station. As of 2019, Royal Railway runs 44 trains each day, and 15–16 freight trains to Sihanoukville and Poipet.
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, Siem Reap - Phnom Penh - Doun Kaev - Kampot high-speed service, and rapid transit construction in Phnom Penh.
Rail transport in Cambodia