Matheran Light Railway Locomotives 1 to 4

{{Infobox locomotive

| name = MLR nos. 1-4

| image = LBNGR MR740 05-09-11.jpeg

| caption = MLR no.740

| powertype = Steam

| builder = Orenstein & Koppel

| serialnumber = 1766, 2342, 2343, 1777{{Cite web|url=https://www.wikidata.org/wiki/Q52882732|title=Matheran Light Railway 1 to 4|website=www.wikidata.org}}

| builddate = 1905{{Cite web|url=https://www.flickr.com/photos/markcarter/5732318612/|title=Matheran|date=June 20, 2018|via=Flickr}}

| totalproduction = 4

| whytetype = {{whyte|0-6-0|T}}

| gauge = {{track gauge|2ft}}

| driverdiameter = {{convert|30|in|m|3|abbr=on}}

| locoweight = 15 tons (empty), 17 tons (working)

| fueltype =

| fuelcap =

| watercap = {{convert|450|impgal|abbr=on}}

| firearea = {{convert|7|sqft|m2|2|abbr=on}}

| boilerpressure = 176 psi

| totalsurface = {{convert|452|sqft|m2|abbr=on}}

{{cite web | url=https://books.google.com/books?id=aE40AQAAMAAJ | title=Locomotive Magazine and Railway Carriage & Wagon Review | date=1907 | publisher=Locomotive Publishing Company }}

| cylindercount = 2

| cylindersize = {{convert|11.81|x|13.78|in|mm|abbr=on}}

| maxspeed =

| tractiveeffort = {{convert|81101|lbf|kN|2|abbr=on}} at 85% boiler pressure {{Cite web|url=http://www.irps-wl.org.uk/232-mlr|title=Matheran Light Railway 740 - IRPS Night Mail|website=www.irps-wl.org.uk}}

| operator = Matheran Hill Railway

| fleetnumbers = MLR 1-4 (old)
MLR 738-741 (new)

| firstrundate = 1907

| retiredate = 1982

| disposition = All four preserved

}}

MLR nos. 1-4 were four steam locomotives that operated on the Matheran Hill Railway, supplied by German engineering company Orenstein and Koppel.{{Cite book |url=http://archive.org/details/railwaylocomotiv20newy |title=Railway and locomotive engineering : a practical journal of railway motive power and rolling stock |date=1901 |publisher=New York : A. Sinclair Co |others=Carnegie Library of Pittsburgh |pages=383}} These locomotives served the railway from its inauguration in 1907, until 1982, when they were withdrawn from service, and completely replaced by diesel locomotives.{{Cite web |title=Matheran Light Railway 740 - IRPS Night Mail |url=http://www.irps-wl.org.uk/232-mlr |access-date=2024-06-30 |website=www.irps-wl.org.uk}}

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.{{Cite book |url=https://books.google.com/books?id=aE40AQAAMAAJ |title=Locomotive Magazine and Railway Carriage & Wagon Review |date=1907 |publisher=Locomotive Publishing Company |pages=49 |language=en}} The design allowed for the rods to remain parallel to the engine at all times, while the wheels would follow the track's curves.{{Cite book |url=http://archive.org/details/railwaylocomotiv20newy |title=Railway and locomotive engineering : a practical journal of railway motive power and rolling stock |date=1901 |publisher=New York : A. Sinclair Co |others=Carnegie Library of Pittsburgh}} 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,{{Cite web |title=Matheran Light Railway 740 - IRPS Night Mail |url=http://www.irps-wl.org.uk/232-mlr |access-date=2024-07-01 |website=www.irps-wl.org.uk}} with all of them preserved at various locations.