The BBÖ ordered two railcars from Simmering for fast direct traffic to tourist destinations, which were delivered in 1936. They used the car bodies of the VT 42 series diesel railcars purchased at the same time in order to reduce development time and costs. Like the ET 10, they had a powered bogie, but due to the significantly lighter construction, a total of four axles were sufficient. With the reduced continuous output compared to the ET 10 and the higher speed at the same time, the tractive effort was no longer sufficient to pull trailers. However, since they were only used on low-traffic connections anyway, this was not a problem.

Shortly after they were put into service, they were assigned to the Reichsbahn, where they got road numbers ET 42 01 and 02. At the ÖBB, they became 4042.01 and 02 and were used up to 1966 on high-speed connections with low passenger numbers. This was followed by a sale to the Steiermärkische Landesbahn, which used them for a full 30 years. They were given the numbers ET 11 and ET 12 and a yellow/red color scheme. Then they came to the association “Nostalgiebahnen in Kärnten”, where one of the vehicles has been in working order again since 2014.