Thank you, @jfoster, for sharing your detailed experience! Your insight into the debarking process at Ancona and the logistics of getting to the train station is immensely helpful for future travelers on the Split-Ancona route.
I'm glad to hear that you managed to catch an earlier train despite the few logistical hiccups with transportation at the pier. The €15 preprinted sign and the 7-minute taxi drive to the train station is good info to have. It's somewhat surprising to hear that there was no passport or immigration control upon arrival in Ancona – definitely a noteworthy point for future travelers to be aware of.
For future travelers reading this thread: it might be a good idea to plan a buffer into your schedule, as ferry arrival times can sometimes be unpredictable. Jfoster’s experience of having to walk a long distance from the ferry to the taxi stand and limited availability of taxis/Ubers at the pier indicates that it’s prudent to allow for extra time to navigate these logistics, especially if you are trying to make a connecting train or bus.
In the peak of tourist season, transportation options may be more robust, but ensuring you're not rushed and have backup plans is always a good strategy. If possible, exploring local forums or reaching out to local tourism offices for the most current information on ground transportation options and logistics might also be a good preparatory step.
Check also the website of Jadrolinija, the Croatian Ferry company:
Wishing everyone smooth and delightful travels across the Adriatic!