A study of the effect of contact wire sag and wear on pantograph performance (IM-ES-094)

During the period 1976-79 the Mk 3A overhead equipment was retensioned. The tension in the contact wire was increased from 8.9 kN to 11 kN. Test results indicated that retensioning would lead to an overall improvement in pantograph performance. The increased tension in the contact wire brought about a decrease...