This map is quite poor in resolution, but reveals valuable plans about the original network.

Lines 1 and 2 are unchanged, while line 3 is noticeably different. The odd shape of Thongil Street is because it was originally intended to bridge over to Angol Flyover over Turu Island, and the original foundations for such a bridge are visible in Google Earth imagery at the end of Thongil Street.
Various sources had also mentioned a fourth stage of the tram network, which was never completed, and possibly referred to completing the loop of line 3.
The fourth line is not included in the legend, unlike lines 1, 2 and 3, so the purpose is unclear.

Source: KCTV, 1990s "Always Working Together for the People".