The news that average rail fares could increase by around 3.5% next year sparked anger but also understanding among passengers in the region. Unions claim costs are rising too quickly for people, while the government says extra money is used to improve services.
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An estimated 90 employees, deemed potential victims, have now been taken to a reception centre where they will be spoken to by officers.
The tunnels were closed in 2013 for restoration that was expected to cost £4 million but actually, cost quadruple that amount.
25-year-old Aaron Armstrong died just weeks after his girlfriend took her own life. His family say they struggled to access support.