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Tr7-3 (ex DRG 56 4103), Jaworzyna Śląska depot, October
11, 2000.
The same locomotive, photographed on August
4, 2004.
Another picture of the Tr7-3, taken by John
Bryant in June 2008 (thanks for permission!).
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In
1940, Tanko Coal Mining Co. of Manchuria
(occupied by Japan,
though formally independent) placed an order with German Maschinenbau und Bahnbedarfs A.G. – former Orenstein &
Koppel – for four freight locomotives with the 1-4-0
axle arrangement. They were roughly similar to DRG class 5620-29,30
(Prussian G82), but had smaller drivers (1300 mm instead of 1400
mm) and larger fireboxes. Probably they were designed to develop comparable
tractive effort while burning low-grade local coal.
These
locomotives were serialled 13330 through 13333; according to www.lokomotive.de (impressive German
locomotive database by Ingo Hütter) they were built in 1940, while most
Polish sources give 1941. Due to war situation they could not be delivered to
Manchuria; most probably it had been intended to send
them via the USSR,
but this was not done before June 1941. Eventually, in June 1942, all four
were purchased by DRG and classed 5641 (service numbers 56
4101 through 4104). All were based in Poznań
and fell into Soviet hands in 1945. Soviet ministry of transport NKPS
probably were not interested in these untypical, though almost brand new
engines, so they were duly handed over to PKP and classed Tr7. All
four were transferred to the Warsaw
regional management in 1948 and remained there throughout their lives; all
except Tr7-2, on which I have no detailed information, were based in
Skierniewice. Tr7-2 was withdrawn in 1964, Tr7-1 two years later and Tr7-4 in
1970. Tr7-3 was the last to go; after a few months in an unglorious role of a
stationary boiler it was formally written off in April 1972, then transferred
to the Railway Museum in Warsaw and finally, in 1991, to the former
locomotive depot in Jaworzyna Śląska (now Industry and Railway Museum).
After external refurbishment in 1998 the machine is in a good condition. It
is coupled with an unidentified tender, probably German four-axle 2’2’T21.5,
erroneously designated 22D23.
There
is something peculiar about this class. Of four examples built one has
survived, although its importance for either country or origin or country
where it spent almost all life (to say nothing of Manchuria!)
is marginal. Many much more numerous and important classes have completely
disappeared. In fact, little is known about these engines and even TB
does not mention them. For this reason, the specification below is far from
complete. I shall be very grateful for any information.
Main technical data
|
No.
|
Parameter
|
Unit
|
Value
|
|
1.
|
Years
of manufacture
|
-
|
1941
|
|
2.
|
Total
built / used in Poland
|
-
|
4 / 4
|
|
3.
|
Tender
class
|
-
|
|
|
4.
|
Axle
arrangement
|
-
|
1-4-0
|
|
5.
|
Design
maximum speed
|
km/h
|
65
|
|
6.
|
Cylinder bore
|
mm
|
2 X 630
|
|
7.
|
Piston
stroke
|
mm
|
660
|
|
8.
|
Engine
rating
|
kW/hp
|
|
|
9.
|
Tractive
effort
|
kG
|
|
|
10.
|
Boiler
pressure
|
MPa
|
1.43
|
|
11.
|
Grate
dimensions
|
m X m
|
3.4 m2
|
|
12.
|
Firebox
heating surface
|
m2
|
|
|
13.
|
Distance
between tube plates
|
mm
|
|
|
14.
|
Number
of flue tubes
|
-
|
|
|
15.
|
Heating
surface of flue tubes
|
m2
|
|
|
16.
|
Number
of smoke tubes
|
-
|
|
|
17.
|
Heating
surface of smoke tubes
|
m2
|
|
|
18.
|
Evaporating
surface, total
|
m2
|
167.4
|
|
19.
|
Superheater
heating surface
|
m2
|
53.1
|
|
20.
|
Diameter
of drivers
|
mm
|
1300
|
|
21.
|
Diameter
of idlers front/rear
|
mm
|
850 / -
|
|
22.
|
Total
weight, empty
|
kg
|
|
|
23.
|
Total
weight, working order
|
kg
|
|
|
24.
|
Adhesive
weight, working order
|
kg
|
|
|
25.
|
Weight
with tender, empty
|
kg
|
|
|
26.
|
Weight
with tender, working order
|
kg
|
130 000
|
|
27.
|
Maximum
axle load
|
T
|
|
|
28.
|
Axle
base (with tender)
|
mm
|
|
|
29.
|
Overall
length (with tender)
|
mm
|
16 995
|
|
30.
|
Brake
type
|
-
|
Knorr
|
References and acknowledgments
Concise
information can be found in AP and PSMK railway fan association website (www.psmk.org.pl).
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