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Soviet Railways series Эмх3
originally Юm005
Soviet Union | 1926 | only one produced

After Lomonosov had already had two different diesel locomotives with electric power transmission built, he also wanted to have a third locomotive built with a different type of power transmission for comparison. The hydrostatic transmission that was actually planned was not yet ready for use. The result was the first and to this day the only large diesel locomotive in history with a mechanical gearbox. It went into operation as Юm005 (Yum005) and was renamed Эмх3 (Ye mkh3).

The chassis consisted of five axles driven by coupling rods and a one-axle and two-axle bogie at each end. The engine came from MAN and was the same as in the Ээл2. Here, however, it was designed to be reversible, since the transmission did not have a reverse gear. It had three gears that were shifted via a magnetically operated friction clutch.

Sectional drawing with dimensions
Sectional drawing with dimensions
The Railway Mechanical Engineer

Although the locomotive achieved a very high level of efficiency of just over 30 percent, the power transmission was not without problems. In addition to jerky loads on the clutches, there were also broken gear wheels. Engine power was soon reduced from 1,200 to 1,050 hp. But even this did not solve the problems, so that the locomotive was soon decommissioned and the diesel-electric competitors prevailed.

General
Built1926
ManufacturerHohenzollern, Krupp
Axle config2-E-1 
Gauge4 ft 11 13/16 in (Russian broad gauge)
Dimensions and Weights
Length54 ft 9 5/16 in
Empty weight276,680 lbs
Service weight288,805 lbs
Adhesive weight194,007 lbs
Axle load48,502 lbs
Power
Power sourcediesel-mechanic
Top speed34 mph
Starting effort33,047 lbf
EngineMAN 6 45/42
Engine type6-cyl. diesel
Engine output1,184 hp (883 kW)
Power Plant
Boiler
Calculated Values
diesel locomotive
freight
prototype
last changed: 06/2022
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