The new sets are to be used by Avanti West Coast in order to increase capacity and replace the existing Class 221 Super Voyagers used on the west coast mainline services to Liverpool and North Wales .
DET ADJ NOUN AUX PART AUX VERB ADP PROPN PROPN PROPN ADP NOUN PART VERB NOUN CCONJ VERB DET VERB PROPN NUM PROPN PROPN VERB ADP DET ADJ NOUN NOUN NOUN ADP PROPN CCONJ PROPN PROPN .