United Parcel Service expects a rail-service rebound after a 'disappointing' 2013 - Progressive Railroading For United Parcel Service (UPS), on-time availability is the most important metric when it comes to measuring rail performance. Instead of tracking a train's arrival time at a yard near a UPS sorting facility, the metric determines if the world’s largest parcel delivery company is provided loads as promised to sort packages on schedule at hubs within its integrated network. UPS taps service from all the Class Is and several other railroads in the United States, and each is assigned an availability goal of 95 percent. “On-time availability is the be all, end all for us. Overall, it’s how we look at impacts on our whole network,” says Ken Buenker, UPS’ vice president of corporate transportation services, who’s responsible for rail transportation company-wide.