In 1987, the first DE 22000 type mainline locomotive with 2200 HP was manufactured under license agreement for DE Mainline Locomotives with American EMD General Motors Company. 39 units of the DE 22000 type mainline locomotive were imported by TCDD and 48 units were manufactured in TÜLOMSAŞ.

The production of various railway work machines (snow-plow, railway mobile cranes, track maintenance cars with light crane, catenary maintenance cars) started in 1987. 46 units of machines were produced in TÜLOMSAŞ.