Eligibility is only the first step
The option generally relates to eligible waitlisted bookings and selected trains or routes. An alternate allocation depends on the scheme rules and availability.
Compare the complete alternate journey
Check the alternate departure time, boarding station, arrival time and onward connection—not only the train name.
Build independent fallbacks
Nearby stations, split journeys and a later departure can help, but allow a realistic transfer buffer and avoid unprotected tight connections.