sentences:  There would later be a dispute between the Conservative-controlled County Council and opposition Liberal Democrat councillors as to whether the structure was structurally sound, with a claim that water draining off the track over the viaduct could lead to crumbling.In March 2008 existing guided vehicles were trialled along a section near Oakington.The vehicles tested included a Wrightbus-bodied single decker owned by FirstGroup, a Plaxton President-bodied Dennis Trident 2 double decker from Lothian Buses, and a white Alexander Dennis Enviro500 triple-axled double decker.