Tetracycline has been studied extensively in clinical trials, with thousands of people worldwide having been evaluated. In these studies, side effects occurring in a group of people taking the drug were documented and compared to the side effects that occurred in a similar group of people not taking the medicine.
Steel ties are utilised in nearly all sectors of the worldwide railroad systems including heavy-haul, class 1s, regional, shortlines, mining, electrified passenger lines (OHLE) and all manner of industries.
Railroads haul intermodal equipment in two types of cars: flatcars and well cars. Many 89-foot flatcars (or pigs, for their role in piggyback service) are still in service, but most of the survivors have been modified to tote two 45-foot trailers - or have been reequipped as two- or three-level to carry auto racks.