This paper uses a system of translog profit and input demand equations to analyze price and technical efficiency in Class I railroads for the period 1978-1983. The results indicate that railroads are neither profit maximizers nor cost minimizers, that capital expenditures increase technical efficiency, and that deregulation led to greater economic efficiency. The average length of haul is negatively related to economic efficiency; track miles are negatively related to economic efficiency, market share positively affects economic efficiency; and, the ratio of freight to total revenue positively affects economic efficiency.