Image 221115, VT 13.20 Birmingham New Street-Preston (2S65), Birmingham New Street station

221115, VT 13.20 Birmingham New Street-Preston (2S65), Birmingham New Street station
221115, VT 13.20 Birmingham New Street-Preston (2S65), Birmingham New Street station 
 The rear end of 221115 'Polmadie Depot' sits in the grey daylight at Birmingham New Street as it waits to leave with the 13.20 to Preston. Can somebody explain the sense of running a diesel powered unit all the way under the wires on this 103 mile journey? 
 Keywords: 221115 13.20 Birmingham New Street-Preston 2S65 Birmingham New Street station
221115, VT 13.20 Birmingham New Street-Preston (2S65), Birmingham New Street station 
 The rear end of 221115 'Polmadie Depot' sits in the grey daylight at Birmingham New Street as it waits to leave with the 13.20 to Preston. Can somebody explain the sense of running a diesel powered unit all the way under the wires on this 103 mile journey? 
 Keywords: 221115 13.20 Birmingham New Street-Preston 2S65 Birmingham New Street station

The rear end of 221115 'Polmadie Depot' sits in the

grey daylight at Birmingham New Street as it waits to leave with the 13.20 to Preston. Can somebody explain the sense of running a diesel powered unit all the way under the wires on this 103 mile journey?