Trucking company PST Vans Inc., 1901 W. 2100 South, had net income of $511,000 or 12 cents per share in the quarter ending Dec. 31, compared with a net loss of $3.1 million or 73 cents per share in the same quarter a year ago.

For 1997, the company had a net loss of $4.3 million or $1.02 per share compared with a net loss of $5.9 million or $1.39 per share in 1996. Kenn-eth R. Norton, chief executive officer, said a strong demand for freight resulted in the net income gain in the fourth quarter.