ERIE — Officials say an all-day bargaining session failed to produce an agreement aimed at heading off the elimination of 950 union jobs at a century-old locomotive manufacturing plant.

GE Transportation and Local 506 of the United Electrical, Radio and Machine Workers walked away from the bargaining table at midnight Saturday without reaching a deal and with both sides expressing some frustration.

The two sides met more than two dozen times since the company announced in April that slowing orders and productivity issues at the Lawrence Park Township plant prompted them to eliminate 100 management and 950 union jobs there. That would leave the company, Erie’s largest employer, with about 4,400 employees.

GE Transportation officials said they sweetened their previous offer on Saturday evening, offering to increase from 375 the number of jobs saved in exchange for changes in work rules and a pay freeze and offering to reduce the wage freeze from three to two years.

Chief Executive Lorenzo Simonelli said the company also sought a new wage scale for any new employees hired and agreed to increase voluntary retirement opportunities and to make a substantial investment in the Erie plant. The union offered at least two counterproposals Saturday night.

Simonelli, who said in April that layoffs would likely begin in October if no agreement was reached, said early Sunday that officials would “consider the situation.”