Pumped-storage station and railway track: what they have in common

1. Step 1. Pumped-storage station — has part — Water turbine. Reversible hydro units.
2. Step 2. Water turbine — evolved from — Water wheel. The turbine is a development of the water wheel.
3. Step 3. Water wheel — is used in — Rolling mill. The first mills were turned by water.
4. Step 4. Rolling mill — is used in — Railway track. Rails are rolled.

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