Oc14

KFNB 180 ‘Nimlau’, later kkStB 207.05 (StEG 1585/1880), location and date unknown. This locomotive remained in Austria and was withdrawn in July 1925. Source: www.commons.wikimedia.org.

According to KT vol. 1, assignment of PKP class designation Oc14 to kaiserlich-königliche Staatsbahnen (kkStB) class 207 is a conjecture, as ultimate confirmation is lacking. Even if this was actually the case, this assignment was only formal, as all locomotives of this type were most probably withdrawn before new designation system came into use. This assignment is confirmed by the monograph of the Kocmyrzów railway (see References), but original source has not been mentioned there.

Austro-Hungarian class 207 numbered just eight engines, originally built in 1880 by StEG for Kaisers Ferdinand-Nordbahn (KFNB) and classed IVc, in 1881 re-classed IIIb3. They featured outer frames, 1-2-0 axle arrangement and 1740 mm drivers. Steam pressure was 10 bar, in two examples (207.02 and 207.03) later increased to 11 bar. These locomotives were given service numbers 176 through 183; all had individual names. They were originally intended for hauling express trains on the Prerau-Mährisch Ostrau line (now Přerov-Ostrava, Czech Republic) and were capable of working a 100-tonne draft on a 6.7‰ gradient at 45 km/h. Following nationalization of KFNB in 1906 they were re-classed 207 and assigned to Vienna and Cracow depots. Typically they were coupled with three-axle class 45 tenders.

After the war class 207 locomotives were equally divided between BBÖ and PKP. All four Austrian engines were withdrawn in 1925. Withdrawal dates of the Polish ones are not known, but all were written off before 1927. Not a single example has been preserved. As already mentioned, PKP class Oc14 designation still remains to be confirmed and assignment of service numbers, if ever took place, is unknown.

Main technical data

No.	Parameter	Unit	Value
1.	Years of manufacture	-	1880
2.	Total built / used in Poland	-	8 / 4
3.	Tender class	-
4.	Axle arrangement	-	1-2-0
5.	Design maximum speed	km/h	80
6.	Cylinder bore	mm	2 X 400
7.	Piston stroke	mm	632
8.	Engine rating	kW/hp
9.	Tractive effort	kG
10.	Boiler pressure	MPa	1.02^1)
11.	Grate dimensions	m X m	2.00 m^2
12.	Firebox heating surface	m^2	7.9
13.	Distance between tube plates	mm	3 900
14.	Number of flue tubes	-	160
15.	Heating surface of flue tubes	m^2	110.5
16.	Number of smoke tubes	-	-
17.	Heating surface of smoke tubes	m^2	-
18.	Evaporating surface, total	m^2	111.7
19.	Superheater heating surface	m^2	-
20.	Diameter of drivers	mm	1 740
21.	Diameter of idlers front/rear	mm	1 186 / -
22.	Total weight, empty	kg	31 700
23.	Total weight, working order	kg	35 600
24.	Weight on drivers, working order	kg	24 600
25.	Weight with tender, empty	kg	42 700
26.	Weight with tender, working order	kg	61 900
27.	Maximum axle load	T
28.	Axle base (with tender)	mm	10 607
29.	Overall length (with tender)	mm	14 459
30.	Brake type	-

1) In two examples later increased to 1.12 MPa.

References and acknowledgments

- LP, KT vol. 1;

- Dzieje kolei kocmyrzowskiej 1899-2010 (The History of the Kocmyrzów Railway 1899-2010) by Roman Garbacik (Eurosprinter, 2015);

- www.de.wikipedia.org.