MLR nos. 1-4 were four steam locomotives that operated on the Matheran Hill Railway, supplied by German engineering company Orenstein and Koppel. These locomotives served the railway from its inauguration in 1907, until 1982, when they were withdrawn from service, and completely replaced by diesel locomotives.

To navigate the tight curves on the MLR, the locomotives were fitted with an articulated wheel design, based on a patent by one John Clark in 1870. The design allowed for the rods to remain parallel to the engine at all times, while the wheels would follow the track's curves. The driving axles were Klien-Lindners.

The locomotives served on the line exclusively until 1965, when diesel traction was introduced on the line. Eventually, the four engines were retired in 1982, with all of them preserved at various locations.

Preserved examples Out of the four Locomotives, only three remain in India, while the fourth has been transported to the UK in 1986, where it passed through multiple owners.

No.738 is plinthed at a mini-garden near the premises of the Neral Toy Train station. No. 739 is situated at National Rail Museum, New Delhi, while No. 741 is plinthed within the yard premises of Matheran Railway Station. No.740 was the locomotive ferried to UK, and was acquired by Amberley Chalk Pits Museum. It was then overhauled to working order. Between 2003 and 2008, it was on service on Leighton Buzzard Railway After a period at the South Tynedale Railway it was sold to the Darnall Locomotive and Railway Heritage Trust.

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Locomotive Magazine and Railway Carriage & Wagon Review, Volume 13- 1907 See pg 48 for an article on Matheran Railway Railway and locomotive engineering See pg 383. MLR no.2 (O&K 2342) and train: Postcard MLR 738 navigating a curve on MLR, 1978 Interior view of MLR 739, at NRM Old Footage of the Matheran Railway in 1975 Shows the Steam locomotives in action on the railway. Timestamps:(3:14-6:35) IRFCA Photo Gallery of MLR class Locomotives Page for MLR 740 at Darnall Locomotive and Railway Heritage Trust's website. Contains updates and images of the ongoing restoration works.