Book rail travel once your match plan is settled. Booking before you know which Tests you are attending and which cities you will be in can result in wasted tickets or onward connections that no longer fit the itinerary.
Avoid tying the entire itinerary to one connection between cities. If one transfer has to work for a later stage of the trip to proceed, any disruption to that leg becomes a serious problem. Build margin where the schedule allows — there are gaps of eight or nine days between each Test, which provides more flexibility than the series dates alone suggest.
Consider flexible or open-return tickets where the cost difference is manageable, particularly for legs involving same-day travel after the close of play. End-of-day Test finishes are not fixed, and the last day of each match can end at any time.
Check final timetables and any planned engineering works closer to each travel date. Keep reservation details — seat, carriage and departure time — available offline in case connectivity is limited around busy match days.