If you thought the airline network was a dog's breakfast, you'd love the train system -- if it was still running. Originally there were two lines, Phnom Penh to Sihanoukville and Phnom Penh to Battambang. As far as we're aware the Sihanoukville line doesn't run anymore, while the Battambang train runs occasionally, perhaps once a week ... on a good month, with the trip taking anywhere from 18 to 24 hours. Note this is not so much a passenger service as much as a freight service (if that) that passengers can ride on. If it does happen to be running when you arrive (which is most likely not to be the case) fares are nominal. Plans are afoot to restore the railway lines, with an Australian company involved on an on again off again basis -- don't hold your breath.