This is a set of skins for Lt Caine's bus v1.3x. These are based on the former NYC DOT-funded private bus companies that used to run a number of services, mainly express services into Manhattan, until they were taken over by MTA Bus in 2005. Also included is one "private bus company" that is still running.
This pack includes:

Colony Island Surface Transit (Roosevelt Island Operating Corp.)
Demand Bus Company, Inc. (Command Bus Company, Inc.)
Libery Lines Local Inc. (Liberty Lines Express Inc.)
New Liberty Bus Service (New York Bus Service)

You can download Lt Caine's bus at http://gtapolicemods.com/downloads.php?do=file&id=288