Print variant of the "Caib" articulated tank car in the Era V design. At the beginning of the 1990s, the first tank cars were built with a so-called "articulated tank". The design of the boilers was such that the two halves of the boiler incline towards the center by 3° in each case. For this reason, the contents of the tank, mainly mineral oil products, flow out almost completely without any further aids. Since the vehicles, which are of lightweight steel construction, are suitable for higher speeds, they were soon procured by other companies throughout Europe. These wagons can be found as P (=private) wagons in the stock of all European railroad companies.