As you asking here I am telling process to do check RRB Mumbai New Recruitment/vacancy notification online:

Go on RRB Mumbai official website

Click on vacancies option given on the top side

By click there you will land on vacancies page which look like this image



As on 31.10.2017 following notification avail there

Commercial Apprentice(Ca),

Traffic Apprentice(Ta),

Goods Guard, Junior Accounts Assistant - Cum Typist(Jaa),

Senior Clerk-Cum Typist And Assistant Station Master (Asm)


Contact info

Main office

Railway Recruitment Board, Mumbai
Divisional office compound,
Mumbai Central,
Mumbai : 400 202
Maharashtra, India

Enquiry Telephone Numbers:

Office (Enquiry):
(022) 23090422, (022) 67644033

Assistant Secretary: (022) 23090224
Member Secretary: (022) 23084064
Chairman: (022) 23071650
Fax: (022) 23090224
Email: asrrb-mum[at]nic[dot]in