 The exteriors of refurbished trains resemble those of the C751B rolling stock . The interior fittings were replaced with white walls and new seats and installed further back to allow more standing space . The colour of seats in the driving trailer was changed from orange to red . Seats of the refurbished cars were lengthened from 43 cm ( 17 in ) to 48 cm ( 19 in ) . Four of seven seats per row were designated as priority seats and were differentiated using a darker colour . 
