BZA is 4 point Junction. When it was being made, Britishers failed to foresee the need of a Bypass Line. Bypass line needed from WL Line to EE Line, WL Line to GDV Line & GDV Line to EE Line. Then GDV trains can avoid BZA going towards EE & WL. Like wise WL trains bypassing BZA going towards EE & GDV.