Wärtsilä has been contracted by German-Swedish ferry operator TT-Line to retrofit an exhaust gas cleaning system to its Ro-Pax vessel, the M/S Robin Hood as part of TT-Line's Green Ship strategy. The full turnkey project will be managed by Wärtsilä thereby minimizing downtime and risk, while guaranteeing performance and regulatory compliance. The contract was signed in October 2013, and delivery and installation will take place during summer 2014. The vessel will be fitted with…