Ignoring the 5 newest trams acquired for the extension - with 18 trams they can reliably run 6-7 minute headways from Helensvale to Broadbeach with all but 2 on the road. I haven’t sat down and done the maths properly but assume they probably need about another 5-6 to bump the headway to every 6 minutes on a daily basis - fewer if they just want to be able to run a more intensive service when there are special events on.