What is SP and SSP in side of railway track? How to get supply of OHE?

#ssp#sp#railwaytraction#indianrailway#knowledgeknorr
Doston es video me bataya gya hai ki railway track k kinare SP and SSP kya hote hai aur kyo banaye jate hai janane k liye video ko pura dekhiye pasand aye to like kijiye share kijiye

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