sentences:  Due to the frequent traffic bottlenecks, jams, and the rapid increase in passenger traffic at the nearby Split Airport (doubling between 2013 and 2017 to 3 million passengers, increasing further at a 23% annual rate), the Split Suburban railway is planned to be extended for roughly 12–14 km further, beyond Kastel Stari to Split Airport and running to Trogir as an endstation.Some older studies from 2000 and 2003 also envisaged extending the line eastward, but this has since been dropped.In 2006 Marijan Klaric, deputy CEO of Croatian Railways, announced the plans to overhaul the Split suburban railway, electrify the lines, add another set of tracks and extend the line to Trogir, but nothing happened.