In 2016 IESco had another project with Tbilisi Metropolitan, creating, composing, installing special compressors for carriage break system, which ended with success.IES-7.5 air screw compressor purpose and work:Screw motor-compressor NK31 nourishes metropolitan carriage break systems, Pneumatic and electrified devices with compressed air.Compressor nourishing is implemented with Danfoss FC-302 inverter which converts constant electricity to variable electricity, which then nourishes compressor with threefold voltage (400+5 and frequency 50 h.) of variable electricity.