One suggestion i have is for a Class 320 and Class 318 dlc pack for the cathcart circle route, adding variety to the current line with just one train which isn’t as reality when the route was set. Both are 3 coach BR EMUs built in york by BREL. I would say the price for the pack should be £20 as it would include 2 new locos/trains for a cheaper price than if you were to buy for example just the 320 for £15.
These two trains are probably better off on a Argyle Line or North Clyde Line DLC as they are more common, Cathcart has those trains but the 380s also run on Cathcart too so it isn't all 318s/320s on that route IRL
I would prefer the Class 380's as they are a more different train where as the Class 320's and Class 318's look similar (not the same) to the Class 314. Plus the Class 380 would have more services, be a more modern train and be the first Desiro in the game. It's also very iconic due to its Desiro whining sound and it's angled gangway which can be positioned for coupling.