In 1923 the small repair workshop had a closed area of 800 m² and many progresses, new units for producing steam locomotive boilers, gears, a carpenter’s shop, other units producing materials for railway bridges, switches and tracks had been made established between the years 1925 and 1928 in the aim of reducing the dependency to other countries. The annual maintenance and repair capacity of the railway repair shop increased in those years to 3-4 locomotives and 30 passenger and freight cars.

During the II. World War, many qualified staff in the Eskişehir Repair Workshop were drafted and this caused to a temporary recession. But, this situation has been overcome in a short time.