4187,4200-4201 are actually in passenger service I don't think those are replacements for the swing buses they have lost since they can just any Bus from the depot to be used a swing bus but who knows thy can eventually be used as one as well but yeah.
Okay well there's a bus at EC not sure if its there now though and there's a pic of it and it said 4677 wish I could show the image for proof on here but I'm not able too.