The section between Ōme and Oku-Tama is now nicknamed as the "Tokyo Adventure Line (東京アドベンチャーライン)".

However, while 209-1000 series trains usually only run on the Chuo Line (Rapid) between Tokyo and Takao stations, on rare occasions (such as a shortage of train sets due to an accident) they may also run on the Ome Line as far as Ome station.

Passenger services were extended to Miyanohira in 1923, the same year the entire line was electrified at 1,200 V DC.

The line was further extended to Mitake in 1929, when the company changed its name to the Ōme Electric Railway Co. and the voltage raised to 1,500 V DC in 1930.

The Haijima to Higashi-Ōme section was double-tracked between 1961 and 1962, CTC signalling was commissioned in 1971, and freight services ceased in 1998.

Work is now undergoing to lengthen station platforms and depot facilities to handle the longer trains.