LAGOS, Nigeria (AP) _ President Ibrahim Babangida announced Tuesday that Rear Adm. Patrick Koshoni would be the new chief of naval staff, the latest appointment in a shakeup of Nigeria's military government.

Koshoni succeeds Rear Adm. Augustus Aikhomu who was appointed chief of general staff on Monday. Koshoni was previously minister of employment, labor and productivity.

Maj. Babangida, who took power in a coup Aug. 27, 1985, announced the new appointments without giving reasons.

On Monday he said the No. 2 man in the military government, Commodore Ebitu Ukiwe, had been relieved of his post and replaced by Aikhomu.

In another development Tuesday, the country's railroads were halted by a strike of the 33,000-member Nigerian National Union of Railwaymen.

Union president Godwin Omoruyi told reporters the strike would continue indefinitely to protest salaries that have gone unpaid since July, and for assurances that spare parts would be obtained to get the rail system working properly.

Omoruyi said there had been cases of railroad workers dying while waiting for retirement benefits that never were paid.