stations in the downtown transit tunnel (excluding Convention Place). King County Executive Ron Sims proposed transferring ownership of the tunnel, along with $130 million in debt and liabilities for maintenance and operations, from King County Metro to Sound Transit in 2004. The two agencies signed an agreement in May 2000 that formally transferred ownership and responsibility for the tunnel to Sound Transit, in exchange for $195.6 million paid to King County Metro. Metro would retain ownership of Convention Place station and other assets, while Sound Transit would convert the tunnel to rail operation after 2004. Sound Transit underwent a funding crisis in 2001 after the Central Link light rail project was found to be over budget and would not be able to open until 2009, three years later than planned. The light rail project was truncated to Westlake station in Downtown Seattle and to Tukwila, the sections north of downtown and south to the airport being deferred to a later date. The King County Council called for a new agreement to be negotiated with Sound Transit adding requirements for an adopted plan for light rail service to Northgate, and for a study into new riders that light rail would bring to the tunnel over a conventional bus network. In early 2002, Sound Transit also explored, and ultimately rejected, a proposal to build a parallel, rail-only tunnel under 5th Avenue that would cost $1 billion. Sound Transit and the King County Council signed a new joint-operations agreement in June 2002, leaving King County Metro as owners of the tunnel and Sound Transit responsible for paying part of the tunnel's debt service at an estimated cost of $65 million. The agreement would allow for buses and light rail trains to share the tunnel and its stations beginning in 2009, after a two-year closure for renovations. A separate agreement signed in May 2003 selected King County Metro as the operator of the light rail line. Metro began testing a fleet of new hybrid diesel-electric buses in 2002, intending to use them in the bus tunnel before and after the conversion to joint bus-rail operations. The first few of a planned fleet of 235 hybrid diesel-electric articulated buses began operating on tunnel bus routes in June 2004. The Breda dual-mode trolleybuses were removed from the tunnel in January 2005 and would later be refurbished into electric-only trolleybuses for use on the city's trolleybus network.