TT Scale. The Ideal Scale.

Songun Pulgungi (Songun Red Flag) No. 1, an advanced AC locomotive fitted up with an asynchronous adhesion motor, has been developed in Korean way at the Kim Jong Thae Electric Locomotive Complex.

In hearty response to the Workers' Party of Korea’s policy of updating the railway transport, the workers of the complex and scientists and technicians in the sector of railway transport conducted an intensive campaign to develop a new type of locomotive by their own efforts and technology.

They concentrated their energy on making asynchronous adhesion motor, auxiliary motor and other main parts.

Thousands of sheets of paper were used for designs, excellent ideas devised and hundreds of technological innovations presented.

They finally succeeded in making a large-capacity asynchronous motor that can smoothly control the traction power and speed of locomotive and that is much better than others in electric braking function to suit the local conditions, thus making a breakthrough in manufacturing an AC locomotive.

Thanks to their persevering efforts a self-steering bogie and efficient high-speed compressor were developed, several kinds of transducers and motors and other auxiliary driving and electric devices developed and manufactured and a computer control system for the new electric locomotive was established.

The AC locomotive was successfully manufactured and the trial runnings were also successful.

Songun Pulgungi No. 1 is up to 50 per cent lower in the total traction power consumption than other electric locomotives while its output is over 2 000 kW and traction power is 1.5 times greater. The introduction of electric brake and the setup of a computer-aided local area control network provide a guarantee for the strict safety of the running of locomotives.