Officials of Guilford Transportation Industries Inc. met Thursday with representatives of its railroads' unions in an attempt to resolve a longstanding dispute over job protection.

The meeting, at which Guilford was to present its plan to resolve the labor woes at its Springfield Terminal Railway, followed a Monday session at which the unions made their preliminary proposals.The negotiations are part of a settlement ordered by the Interstate Commerce Commission over Guilford's leasing of its Boston & Maine, Maine Central and Portland Terminal railroads to the Springfield Terminal.

The ICC has mandated that the railroad and the unions agree to a provision to protect workers affected by the leasing program.

Meanwhile, Federal Railroad Administrator John H. Riley was scheduled to meet today with Maine Gov. John R. McKernan Jr. to discuss the ongoing labor strife at the Springfield Terminal Railway that has led to two strikes in two years and disrupted rail shipments in New England.

According to a spokesman for Mr. Riley, the meeting is a continuation of one the two men had held in Washington recently.

One topic is expected to be Gov. McKernan's interest in having Maine included in the program to assist the Federal Railroad Administration in its inspection of carriers in the state.

Under the program, the agency provides a portion of the funding and the training to state inspectors as an adjunct to ongoing safety procedures.

According to an agency spokesman, 32 states already participate in the State Safety Participation Plan.