Electric Locomotive

I want information regarding Earthing used for electrical / electronic devices?

Dear Freinds ,

I think earthing is necessary not only for small electrical and electronic systems but also electric locomotives used by our railways.
I read somewhere that for electric locomotives earthing would be acheived by the help of rails on which they run and the electricity will straight away go back to Substation to complete the circuit.
can anyone please give me details of the same.

Yes, electric trains commonly use an "earth-return" system where the rails themselves are the return conductors between the electric traction motors and the traction substation.

By contrast, earthing for household electrical systems is for protection and safety systems and not for carrying the working load current.

However single-wire earth return (google SWER) circuits were used 100 years ago for household power supplies and are still used in some very remote areas to save on line capital costs.

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