I am very frustrated that Interrail does not cover many small railways in Italy despite comparable prices to other big countries. And I do not think Interrail is very clear about this.
My question is this. Several small railways have been taken over by Trenitalia - the latest is Sistemi Territoriali from Venice. Others include FSE which covers the WHOLE of the Italy boot and FCU in Umbria. As Trenitalia is now the operator, does Interrail now cover these lines. If IR is not valid, why not ? David Haydock
