Hi Andy,
please take a look at the manual. There you will find explanations for transferring the locomotive and solenoid devices from Win-Digipet to the ECoS and also the linking of these objects in the ECoS with their counterparts in Win-Digipet. I think you have just to search for transfer.
See chapter 5.4.7 and 5.4.8 for locomotives and chapter 7.2.3, 7.2.4 and 7.8 for solenoid devices.
Regards
Markus