This pack would include 2 units which are used frequently not only on Cathcart Circle services, but also a lot of other services out of Glasgow Central, which would make the station less empty during the day as well as giving extra ECS moves from Shields depot. Class 320 Something people may not be aware of is that there is 2 subclasses of 320, with 22 units forming the Class 320/3 which is capable of 90mph, and 20 Ex 321/4 forming the Class 320/4, being capable of 100mph due to their conversion from 321’s. Some of these converted units, namely 320411, 412 and 416 retained their London Midland livery for a short period after conversion. All 42 sets are 3 carriages long and have an acceleration of 1.2 mph/s. They can also work in multiple with Class 318’s. Class 318 Built with a gangway connection at the cab front originally, these units usually work in pairs with themselves or Class 320’s, and are most commonly seen on services through the Low Level lines, but can occasionally be seen working services from the high level to Newton, Neilston and Wemyss Bay. They have a top speed of 90mph and an acceleration of 1.3mph/s. In 2005 - 2007, they were given a new cab front design to improve the driver’s visibility.