Integrated Railway System PFI Feasibility Study was proposed by the Konsortium Transonic (Sabah) Sdn Bhd on the 3rd August 2023. The following are the proposed train routes in Sabah by Transonic:

ROUTE NO. 1:

KOTA KINABALU TO TENOM TRAIN.
Tg. Aru > Papar > Beaufort > Halogiat > Tenom > Melalap.

ROUTE NO. 2:

KOTA KINABALU TO PITAS TRAIN.
Tanjung Aru > Tuaran > Kota Belud > Pitas.

ROUTE NO. 3:

TENOM TO TAWAU TRAIN.
Tenom > Melalap > Keningau > Sook > Nabawan > Pensiangan > Kalabakan > Tawau.

ROUTE NO. 4:

TAWAU TO SANDAKAN TRAIN.
Tawau > Semporna> Sandakan.

ROUTE NO. 5:

SANDAKAN TO KOTA KINABALU TRAIN.
Sandakan > Beluran > Pitas > Kota Belud > Tuaran > Tanjung Aru.

The proposed integrated railway network will served the greater area of Sabah Tourism Destination, Commercial, People, Medical Health and Cargo to Seaport.