How are dimensional loads handled? How does this effect the transit time?
Dimensional loads usually impede the efficient flow of train traffic on Union Pacific. This effect is the result of speed restrictions placed on dimensional loads so that they can be handled safely. Most trains handling dimensional loads are restricted to the slowest speed at which the dimensional load can be moved by rail. That is usually 45 mph or less. Union Pacific’s scheduled or timetable speed in many corridors is 60 mph or greater. Consequently, trains hauling dimensional loads occupy more track time and cause other freight trains to wait longer in terminals or in sidings. The net result is that unlike standard manifest freight, dimensional loads must be “manually” scheduled from terminal to terminal by the UP Operating Department. This adds significantly more transit time in order to make sure the freight can be handled in a safe manner.
