Another 'pain in the arse' journey on XC today, when YET AGAIN the second set of the Edinburgh-bound double voyager sent from New Street was locked out of use. It's getting a regular occurrence and means everyone crammed onto 4 cars, not helped by the earlier 170 to Notts being cancelled. Honestly why can't the second set be used? The guard/train manager can surely switch between the two units at stations and communication systems works between the 2 sets in case of a problem??? I assume the reason the second set was locked due to staffing issues - SORT IT OUT!!!!!!