I'm pretty sure those by stevelerro come from KLTrainz, just not sure which pack
From "GTW-Ohio Central U3b 4-8-4 Confederation" pack:
<kuid:68926:63251020> GTW Coach Heavyweight
<kuid:68926:63251030> GTW Coach Lightweight V1
<kuid:68926:63251050> GTW Coach Lightweight V2