Hi buddy, can you give me URL address of RRB (Railway Recruitment Board) Allahabad website for check latest recruitment notification and download application form for apply online for take part in its recruitment exam?

There are total 21 Railway Recruitment Boards (RRBs) located in India.

Ahmedabad
Allahabad
Bhopal
Bhubaneshwar
Chandigarh
Chennai
Guwahati
Kolkata
Mumbai
Ranchi
Secunderabad
Ajmer
Bilaspur
Jammu
Malda
Gorakhpur
Bangalore
Patna
Siliguri
Trivendrum
Muzaffarpur

As you want official website of all these RRBs, so here I am providing following websites:

Ahmedabad rrbahmedabad.gov.in
Ajmer rrbajmer.gov.in
Allahabad rrbald.gov.in
Bangalore rrbbnc.gov.in
Bhopal rrbbpl.nic.in
Bhubaneshwar rrbbbs.gov.in
Bilaspur rrbbilaspur.gov.in
Chandigarh rrbcdg.gov.in
Chennai rrbchennai.net
Gorakhpur rrbgkp.gov.in
Guwahati rrbguwahati.gov.in
Jammu rrbjammu.nic.in
Kolkata rrbkolkata.org
Malda rrbmalda.gov.in
Mumbai rrbmumbai.gov.in
Muzaffarpur rrbmuzaffarpur.gov.in
Patna rrbpatna.gov.in
Ranchi rrbranchi.org
Secunderabad rrbsecunderabad.nic.in/
Siliguri rrbsiliguri.org
Trivendrum rrbthiruvananthapuram.net