Ryam Sugar Factory Railway
The Ryam Sugar Factory Railway was owned and operated by the Ryam Sugar Factory in Bihar, India.

History 
The Ryam Sugar Factory was incorporated in 1914 as the Tirhut Co-operative Sugar Co Ltd. It was located in a town now known as Raiyam (मैथिली) 15 km north-east of Darbhanga. The factory had two 2 ft (610 mm) narrow gauge railway lines operating as a field system, to bring cane into the factory:
 Line to Mokaddampur, 14 km long, which remained in use until its closure in 1994. 
 Line to Sakri, 10 km long, a station on the 'Darbhanga-Bhaptiahi Branch Line' of the Bengal Nagpur Railway (BNR). This line was closed significantly earlier than the other line.

Stationary steam engines 
In No. 1 Mill stationary steam engine #2619 (1932) by Mirrlees, Watson was used (single cylinder, 24” x 48”, 273 hp, Corliss valves, cost Rs 16000 new). A Nos 2, 3 and 4 Mills stationary steam engine #2423 (1914) by Mirrlees, Watson was installed (single cylinder, 300 hp, piston valves, cost Rs 15000 new).

Locomotives

References 

2 ft gauge railways in India
History of rail transport in Bihar
Railway lines closed in 1994