Steam Engine OKl27 | Model Scenery Tutorials

About Steam Engine OKl27 including pictures a model of such an engine that is located in the Warsaw Train Museum.

The OKl27 steam engine maintains a special place in the railroad history of Poland as the OKl27 steam engine was the first locomotive completely designed and manufactured in Poland.

It was reliable, well-liked, and enjoyed many years of reliable operations on railroads around Europe. The successor to the postwar locomotive steam engine was TKt48.

The engine OKl27 was manufactured on the order of the Polish Ministry of communications based on a design presented by Cegielski factory in Poznan, and approved by PKP ( the Polish Railroad) in 1927.

The rationale for its construction was a shortage of passenger locomotives that could service suburban lines.

By 1928 the factory delivered four locomotives and subsequently produced an additional 118. They ceased production in 1933.

This type locomotive was designed for passenger services on suburban lines. It, being a tank locomotive, could run at full speed in both directions and was capable of fast startup and frequent stops.

Generally, due to instability, the locomotive generally did not run above 50 km/h.

It was a well-designed locomotives and used by the Polish railways for about 50 years. The last OKl27 (OKl27 – 10) was used for switching at the Skierniewice locomotive depot until 1979. It is still there, though not in operable condition.

During the Second World War engines were taken by both the Germans and Russians. They were scattered around Europe with engines being found in Austria Czechoslovakia and France.

There are four surviving specimens:

OKl27-26 – Location – Warsaw Railroad Museum
OKl27-10 – Location – Skierniewice Locomotive Depot
OKl27-27 – Location – Gdynia Grabowek Locomotive Depot
OKl27-41 – Location – Chabowka Rolling Stock Heritage Park “Skansen”

PKP Designator

O designates a passenger locomotive
K designates a tank locomotive
l designates the axle arrangement 1-3-1
27 designates the year of the design.

OKl27 Technical Data

The data in the table below is credited to Locomotives.com.pl . Visit that site for much more information about the OKl27

No.	Parameter	Unit	Value
1.	Years of manufacture	–	1928 – 1933
2.	Total built / used in Poland	–	122 / 122
3.	Tender class	–	–
4.	Axle arrangement	–	1-3-1
5.	Design maximum speed	km/h	80
6.	Cylinder bore	mm	2 X 540
7.	Piston stroke	mm	630
8.	Engine rating	kW/hp	685 / 930
9.	Tractive effort	kG	10 300
10.	Boiler pressure	MPa	1.22
11.	Grate dimensions	m X m	2.42 X 1.01
12.	Firebox heating surface	m2	11.44
13.	Distance between tube plates	mm	4150
14.	Number of flue tubes	–	123
15.	Heating surface of flue tubes	m2	73.6
16.	Number of smoke tubes	–	24
17.	Heating surface of smoke tubes	m2	39.11
18.	Evaporating surface, total	m2	124.15
19.	Superheater heating surface	m2	42.2
20.	Diameter of drivers	mm	1500
21.	Diameter of idlers front/rear	mm	860 / 860
22.	Total weight, empty	kg	67 6802)
23.	Total weight, working order	kg	85 1002)
24.	Adhesive weight, working order	kg	54 2002)
25.	Weight with tender, empty	kg	–
26.	Weight with tender, working order	kg	–
27.	Maximum axle load	T	16.81)
28.	Axle base (with tender)	mm	9 000
29.	Overall length (with tender)	mm	12 8632)
30.	Brake type	–	Westinghouse

1) Adjusted from 16.0 to 17.5 tonnes (from OKl27-21 onwards, 18.2 tonnes) by changing suspension levers mounting.
2) Up to OKl27-20 inclusive: overall length 12 613 mm, weight empty 61 500 kg, in working order 80 800 kg, weight on drivers 51 800 kg.