Pantograph and shaduf: what they have in common

1. Step 1. Pantograph — is part of — Electric locomotive. Current is collected by a pantograph.
2. Step 2. Electric locomotive — is used in — Metro. The first lines were steam-operated; electric trains since 1890.
3. Step 3. Metro — uses — Railway track. It runs on rails.
4. Step 4. Railway track — is used in — Funicular. Rails.
5. Step 5. Funicular — uses — Counterweight. The cars balance each other.
6. Step 6. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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