P Rajasekhar, a Senior Signal and Telecom Engineer in Rail Nilayam, who was also in-charge of examination centres and M Maschendar, a grade-I technician, both prime accused, who were on the run since the scam was busted on November 30 last were arrested along with one C P Kumar, a private employee from different locations, police said.
Cyberabad Police had earlier arrested 30 people, including 10 candidates, and found that Maschendar had allegedly masterminded the racket with the help of few others.
According to police, in 2006, Maschendar had fraudulently got Railway Recruitment Board (RRB) question papers and had convinced 11 candidates, who got jobs and were now working in various places, to write the exams.
Similarly, this year Maschendar lured Rajasekhar by giving Rs 50,000 per exam day, who in turn took out a question paper after commencement of examination and gave to Maschendar and his cousin Mahender, also a railway employee.
"About 40 more people, including Mahender and some more candidates, are yet to be arrested," police said adding it was clearly established that RRC examination papers were being leaked out with the involvement of railway officers in all ranks for getting jobs to their friends and relatives.
The mass copying using electronic devices was detected in the last phase of the exam on November 30, when police raided an area in Salarjung, from where the gang was operating.
Electronic devices with in-built SIM cards, laptops, printer, ear-pins like bluetooth, cellphones, data cards and cables, besides 17 bikes were recovered from the accused.