Mecklenburg P 4.2

Mecklenburg P 4.2 DRG Class 36.6
Number(s)	DRG 36 602 - 620, 651 - 662
Quantity	31
Year(s) of manufacture	1903–1912
Retired	1931
Wheel arrangement	4-4-0
Axle arrangement	2'B n2v
Gauge	1,435 mm
Length over buffers	17,645 mm
Service weight	50.4 t
Adhesive weight	19.6 t
Axle load	14.9 t
Top speed	90 km/h
Indicated Power	427 kW
Driving wheel diameter	1,750 mm
Leading wheel diameter	1,000 mm
No. of cylinders	2
Cylinder bore	460/680 mm
Piston stroke	600 mm
Grate area	2.31 m²
Evaporative heating area	118.85 m²
Tender	pr 3 T 12/ pr 2'2' T 16
Water capacity	12.0/16.0 m³

The Mecklenburg Class P 4.2, formerly Class VII, were early German steam locomotives operated by the Grand Duchy of Mecklenburg Friedrich-Franz Railway and were used specifically for hauling express trains on the line from Warnemünde to Berlin. They were mechanically identical with the Prussian P 4.2. All 31 units were taken over by the Deutsche Reichsbahn who incorporated them as Class 36.6 with numbers 36 602–620 and 651–662. The first series of numbers were engines with a 14 t axle load, the second those with a 15 t axle load. In 1931 the last locomotive of this class was retired.

No. 36 601 was a Prussian P 4.2 that was redeployed to Mecklenburg in 1920.

Apart from three units, these engines were equipped with Class 2'2' T 16 tenders.