Finnpusku

Pusher Rautaruukki and barge Kalla outside Luleå, Sweden.
Class overview
Builders	Hollming Oy, Rauma, Finland Estaleiros Navais de Setubal, Setúbal, Portugal
Operators	1986–2003: Oy Finnlines Ltd 2003–: ESL Shipping Ltd
Built	1985–1987
In service	1986–
Completed	1986: Rautaruukki, Kalla, Tasku 1987: Finn, Baltic, Board, Bulk 1991: Herakles (conversion)
Lost	Finn and Baltic, 1990 (returned to service) Herakles and Bulk, 2004 (total loss)
General characteristics (combination)
Type	Integrated tug and barge
Classification	DNV 1A1, Pusher/Barge Unit, Ice IA+
Tonnage	10,620 GT 3,187 NT 14,447 DWT
Displacement	20,930 tons (fully loaded) 17,630 tons (ballast)
Length	166.6 m (546.6 ft)
Beam	27.2 m (89.2 ft)
Draught	6.7 m (22.0 ft)
Depth	10.0 m (32.8 ft)
Ice class	1A Super
Main engines	2 × Wärtsilä-Sulzer 6ZAL40 (2 × 3,840 kW)
Auxiliary generators	2 × Wärtsilä-Vasa 4R22HF (2 × 590 kW/710 kVA) Strömberg shaft generator (900 kVA)
Propulsion	CPP, ⌀ 4.7 m (15.4 ft) Bow thruster (680 kW)
Speed	13.4 knots (24.8 km/h; 15.4 mph)
Crew	9

Finnpusku is an integrated tug and barge system owned and operated by ESL Shipping, a Finnish shipping company that specializes in bulk cargo transports in the Baltic Sea. The system was developed in the 1980s by Finnlines, another Finnish shipping company that also managed the vessels until 2003, in co-operation with Rautaruukki to transport raw materials to the Raahe Steel Works. Two pushers and five barges, four of which remain in service, were delivered by Hollming in 1986–1987.

Today the Finnpusku system consists of pushers Rautaruukki and Steel, and barges Board, Botnia, Kalla and Tasku.