58 005 & 58 004 at Toton TMD. 02/03/85.
CM&EE department 'Test Car 6' (ADB 975290) is seen sandwiched between 58 005 and 58 004 in the sidings at Toton Depot between testing on loaded MGR trains in the area.
At the time new class 58's were experiencing wheelslip issues and causing rail burns which was thought to stem from the bogie centre wheel set springing arrangement. 58 004 was fitted with modified centre axle springs on both bogies and to draw a comparison similar aged 58 005 was attached the other end of the Chief Mechanical & Electrical Engineers Test Car No.6. The pair were used with the coach to conduct trials on loaded MGR coal trains out of Sutton Colliery. The result of the testing suggested the revised springing made little difference but testing revealed a problem with the traction motors when running in slow speed mode with the motors configured in series. Testing revealed the centre axle could spin to 20mph when others were at 0.5mph. In the end the 58's were modified to perform more like a class 56 in slow speed mode where the motors run in series-parallel to cope with low adhesion.
58 005 & 58 004 at Toton TMD. 02/03/85.
CM&EE department 'Test Car 6' (ADB 975290) is seen sandwiched between 58 005 and 58 004 in the sidings at Toton Depot between testing on loaded MGR trains in the area.
At the time new class 58's were experiencing wheelslip issues and causing rail burns which was thought to stem from the bogie centre wheel set springing arrangement. 58 004 was fitted with modified centre axle springs on both bogies and to draw a comparison similar aged 58 005 was attached the other end of the Chief Mechanical & Electrical Engineers Test Car No.6. The pair were used with the coach to conduct trials on loaded MGR coal trains out of Sutton Colliery. The result of the testing suggested the revised springing made little difference but testing revealed a problem with the traction motors when running in slow speed mode with the motors configured in series. Testing revealed the centre axle could spin to 20mph when others were at 0.5mph. In the end the 58's were modified to perform more like a class 56 in slow speed mode where the motors run in series-parallel to cope with low adhesion.