In 2018, CN spent approximately $3.5 billion in its capital program, with $1.6 billion invested to maintain the safety and integrity of the network, particularly track infrastructure. CN's capital spending also included $1.0 billion on strategic initiatives to increase capacity, enable growth and improve network resiliency, including line capacity upgrades and information technology initiatives, $0.5 billion on equipment capital expenditures, including the acquisition of 500 new centerbeam cars and 65 new high-horsepower locomotives, and $0.4 billion on implementation of Positive Train Control (PTC), the safety technology mandated by the U.S. Congress.