Arus Company Trips 2. On the Day: TCDD and its Subsidiaries TÜLOMSAŞ, TÜVASAŞ and TÜDEMSAŞ National Train Production, the II. Day, Global Teknik, Extra Metal, Elfa-Metal, Ankara Olimpia Glass industry and ILGAZ / Polatlı factories were visited. There was quite a useful visit and information was exchanged. Thus, studies on domestic production in the National Train continues in full swing.