I don't know much about TGR / TasRail but I believe the carriages you maybe looking for can be found here from Taipan Studios
https://payhip.com/taipanstudio/collection/all
Expression of interest:
There is a Fingal line by pware, on the DLS
Route:
<kuid2:45176:100126:1> TGR Fingal Line 1955 Narrow Gauge (3ft 6in - 1067mm) (TANE SP2)
Sessions:
<kuid2:45176:100079:1> TGR Fingal Session 4A: Conara Mixed Goods ADVANCED Version
<kuid2:45176:100063:1> TGR Fingal Session 4: Conara Mixed Goods BASIC Version
<kuid2:45176:100103:1> TGR Fingal Session 5E: Cornwall and Mt Nicholas Coal EXPERT Version
<kuid2:45176:100046:1> TGR Fingal Session 7: Free Roam
<kuid2:45176:100078:1> TGR Fingal Session 4E: Conara Mixed Goods EXPERT Version
<kuid:45176:100106> TGR Fingal Session 6S: Avoca Coal Shuttle SHUNT Version
<kuid2:45176:100010:1> TGR Fingal Session 2: St Marys Night Passenger DRIVE Version
<kuid:45176:100576> TGR Fingal Session 1: St Marys Day Mixed Passenger RIDE Version
<kuid:45176:100109> TGR Fingal Session 6E: Avoca Coal Shuttle EXPERT Version
<kuid:45176:100084> TGR Fingal Session 6: Avoca Coal Shuttle BASIC Version
<kuid:45176:100080> TGR Fingal Session 5: Cornwall and Mt Nicholas Coal BASIC Version
<kuid:45176:100026> TGR Fingal Session 3: ASG Transfer BASIC Version
<kuid:45176:100067> TGR Fingal Session 3E: ASG Transfer EXPERT Version