I propose adding the Merseyrail Northen Line / Wirral Line and 507/508 PEPs to TS, as a local to the network I find it sad that the network, or its trains, are nowhere to be seen. 31x trains are the closest to the PEPs. The Class 777 IPEMU would also be nice to see on the network. It would also connect Chester and Liverpool Lime Street, while also opening up an idea for the Borderlands Line (TfW Bidston - Wrexham), creating the Merseyrail network and its units will open up so many oppertunities and connect others, while also letting me drive my local line happily. It would make me so happy to see the Merseyrail network!
If I recall it was Waggonz as they were doing the class 507/508 (I forget which one it is) but I haven't seen any mention of it for a few years now.
