PKP class EP07

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PKP class EP07
Pantograph
Traction motors	EE 541 LKb 535, 76:21 gear ratio
Loco brake	Oerlikon

Performance figures
Maximum speed	125 km/h (78 mph)
Power output	2,000 kW (2,680 hp)
Tractive effort	280 kN (62,950 lbf)

Career
Operators	PKP
Nicknames	Siódema

PKP class EP07 is a class of standard-gauge electric locomotives used primarily for passenger trains in Poland. They are rebuilt EU07 class locomotives, which in turn are the direct successors to the post-war British EU06 series locomotives. The only operators of this locomotive series are PKP Intercity and Polregio.

These locomotives constitute the vast majority of electric locomotives still serving the PKP Group today - they are used to drive both light and heavy passenger trains through the whole of Poland.

History

Since 1995, some EU07 locomotives  have undergone a reconstruction, in which new

.

The change of gear ratio did not, however, increase the design speed (misaligned transmission system - hollow shaft bearing on slide bearings), but decreased the engine speed, making it difficult to drive freight trains with this locomotive. It has become easier to maintain the maximum speed of the locomotive while reducing breakdowns. Starting acceleration has also increased - especially at higher speeds, which is realized with less weakening of the excitation (and thus higher motor power). The new LKb535 traction motors, instead of EE541, are adapted to the higher permissible operating temperature. The maximum permitted engine speed for EE541b is 2390 rpm, for EU07 series locomotives with maximum axle rims and 120 km/h, traction engines reach 2380 rpm and EP07 engines in the same situation only reach 1962 rpm, which increases their durability. The rebuilt units kept their rolling stock number (e.g. the EU07-330 locomotive became the EP07-330 locomotive).^[1]

In December 2006, 74 EP07 and EU07 class locomotives belonging to

were installed. The locomotives have been renumbered from 1001 upwards.

In the years 2012-2013 5 EU07 of

was rebuilt to EP07P type, they received a new numbering from 2001 onwards. The modernization included installation of static converter, WN and NN cabinets, new panels in driver's cabins, air conditioning and repair of traction motors. On the front a diode display was installed.

Nickname

• Siódemka (The Seven) - from the number

See also

• Polish locomotives designation

References

External links

• PKP IC EP07 @ Trainspo
• Modern Locos Gallery
• Rail Service
• Mikoleje
• Chabówka Rail Museum
• Media related to PKP class EP07 at Wikimedia Commons

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