After the four class 76 freight locomotives had been put into service on the Arlberg in 1884, the class 73 shown here was introduced only one year later. The new locomotive was also a 0-8-0, but had smaller cylinders and produced around 700 hp. As the first batches were built for the Arlberg Railway, they were just called “Arlberg type”. Soon they were also built for the Galician Transversal Railway and many other lines.