(13 Jan 2016, 8:44 pm)GX03 SVC wrote 7412-5 can't be spares as they are not permitted to do the X18 due to the height of the vehicle.
Back in 2014 when the first batch of B7TLs came up here I remember one doing the 10:00 full X18 to Berwick, There both full-height vehicles unless there's a difference I haven't noticed yet?