"Unorganised" would imply that it is not at all organised, which is probably not true - rail networks have a great deal of structure and organisation. You appear to be making a comment on the quality of its organisation rather than a complete absence of it.

What I think you mean to say is that it is 'badly organised', 'poorly run', or perhaps 'mismanaged'.

"Unorganised" would imply that it is not at all organised, which is probably not true - transport networks have a great deal of structure and organisation. You appear to be making a comment on the quality of its organisation rather than a complete absence of it.

What I think you mean to say is that it is 'disorganised', meaning "badly planned and without order". You could also say it is 'badly organised', 'poorly run', or perhaps 'mismanaged'.