can you explain its steam turbines?
It was the final major evolution of the steam engine design as they are more efficient than reciprocating piston type steam engines.
Steam engine
The final major evolution of the steam engine design was the use of steam turbines starting in the late part of the 19th century. Steam turbines are generally more efficient than reciprocating piston type steam engines 
what is nsb el 9? It is a retired class of three electric locomotives. who built it? Thune. who is he? They are a Norwegian manufacturing company. when was it founded? 1815. who were its founders? Anders Paulsen Thune. what can you tell about their history? Started in Drammen, produces agricultural machinery and steam engines. The factory expanded to Skøyen in Aker in 1901. tell me more about the latter It is a heat engine that performs mechanical work using steam as its working fluid.
wiki:19674132
Steam engine [SEP] Steam turbines
The final major evolution of the steam engine design was the use of steam turbines starting in the late part of the 19th century. Steam turbines are generally more efficient than reciprocating piston type steam engines (for outputs above several hundred horsepower), have fewer moving parts, and provide rotary power directly instead of through a connecting rod system or similar means. Steam turbines virtually replaced reciprocating engines in electricity generating stations early in the 20th century, where their efficiency, higher speed appropriate to generator service, and smooth rotation were advantages. Today most electric power is provided by steam turbines. In the United States, 90% of the electric power is produced in this way using a variety of heat sources.