Since the 1930s existed a 19.3 kilometres (12.0 mi) long narrow gauge railway with a gauge of mit 600 mm from Seria to Badas.
The alignment of the railway with wooden rails was built by the British Malayan Petroleum Company (BMP, now Brunei Shell Petroleum), to transport water from a pumping station in Badas, which was operated by George William Percival Clark at the Sungai Belait River, to Seria.
It was subsequently used, to transport pipeline tubes.

The employees of BMP hid during World War II the most important parts of the railway from the Japanese, who consequently couldn't operate it.
After liberation by the 9th Division of the Australian Army the hidden parts re-appeared in July 1945, and the railway was quickly re-commissioned, to transport two 25-pound howitzers and their ammunition to Badas, to disperse Japanese troops, which were still in the area.

According to some reports, the railway was still being used in 1999.
The tracks are still  in use for transporting trees and as a walkway.
Since the 1930s existed a 19.3 kilometres (12.0 mi) long narrow gauge railway with a gauge of mit 600 mm from Seria to Badas. The alignment of the railway with wooden rails was built by the British Malayan Petroleum Company (BMP, now Brunei Shell Petroleum), to transport water from a pumping station in Badas, which was operated by George William Percival Clark at the Sungai Belait River, to Seria. It was subsequently used, to transport pipeline tubes.
The employees of BMP hid during World War II the most important parts of the railway from the Japanese, who consequently couldn't operate it. After liberation by the 9th Division of the Australian Army the hidden parts re-appeared in July 1945, and the railway was quickly re-commissioned, to transport two 25-pound howitzers and their ammunition to Badas, to disperse Japanese troops, which were still in the area.
According to some reports, the railway was still being used in 1999. The tracks are still  in use for transporting trees and as a walkway.
Rail transport in Brunei