Diffrence between Senior section engineer and Assistant Divisional Engineer

Respected sir/madam,

Iam Sudarshan a mechanical graduate. I would wish to join railways. Iam interested in becoming a Assistant divisional engineer or a senior section engineer. Can you please help me knowing the difference between the above two positions. It would be of great help if you can let me know the class, pay scale and the career pathways for both the positions. Also can be please tell me what is SSE iow.

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