livery names to user ip address mod modified is used to show which type of swt express livery the unit is in one conforms with the disability discrimination act the other one does not not to show each unit has been modified recently with a new livery there is only one type of grey and white livery and only one type of gatwick express livery on the 's so there is no need to put mod at chart leacon if you have another reason for puting mod at chart leacon on other units please explain here