MINEOLA, N.Y. (AP) — Pessimism grew about the prospects of a strike at the nation’s largest commuter railroad this weekend after union negotiators said Monday that talks had collapsed amid a dispute over whether future Long Island Rail Road employees should be required to contribute to their health insurance and pensions.

A walkout, which the unions said they were planning at 12:01 a.m. next Sunday, would affect 300,000 daily riders who travel in and out of New York City from Long Island.