why not think on same as reverse . Some one want to go to SRGM on 25th April and he search between Madurai to SRGM in IRCTC with date 25th April and this train show Availability and the customer when search in IRI for the 25th April then this train will not show in list of trains . so the customer will think that IRI is not updated.
For your question if today and tomorrow some one want to go then he will search first Availability and he will get the message ISL station deleted so nothing wrong it when user does not get Availability he will not board the train.
It...
more... is so simple but you need some experience like basu .