I'm in Monterosso right now. I bought most of our (longer) train travel in advance through Trenitalia's website before we left the US. This includes the trip from Monterosso to Venice on June 20. Now that I've spent a day in Cinque Terre, I see how late the trains run, and I realize there is a very good chance those delays are going to mess up our current itinerary, which is
Monterosso-Pisa Centrale (9:05 - 10:17)
Pisa Centrale - Firenze (10:32 - 11:32)
Firenze - Venezia SL (12:15 - 14:20)
I can reduce the number of connections from 2 to 1 by going via Milano Centrale. That trip will take about an hour longer, and I like the fact there's one fewer connection. However, the connection in Milan is also a 15-minute connection, just like the current reservation via Pisa.
So how should I plan to travel to Venice given the trains are late but the connection timings are tight? The tickets I already bought (Monterosso to Venice via Pisa and Florence) were on "Bimbini Gratis" fare, so it's refundable (minus 20%) and changeable before departure.