It really depends, most authors use the following payware routes! For Australia, UK, US, Canada and other countries.
<kuid2:57230:100258:14> West from Denver - Moffat Route
<kuid2:1854:2:1> VR Healesville - 1913-1920 TRS19
<kuid2:661281:200040:16> Schwaninger Land
<kuid2:88211:100008:22> Bairnsdale to Orbost Line C1970-80s
<kuid2:354694:100247:24> Beloreck - South Ural Mountains
<kuid2:179051:102285:11> Liskeard to Looe
<kuid2:605579:102524:5> Model Trainz: New South Wales Region
<kuid2:515942:100169:21> Cornish Mainline and Branches - TRS19
<kuid2:154322:100063:19> ECML EDINBURGH - DUNDEE
<kuid2:57230:100074:14> Sebino Lake, Italy (1980s)
<kuid2:487560:69000:6> Mojave Sub Division
<kuid2:620415:101000:15> Niddertalbahn - TRS19
<kuid2:122860:100436:27> Canadian Rocky Mountains - Golden, BC
<kuid2:82412:104611:9> Milwaukee Road Avery-Drexel
<kuid2:429398:100003:13> Japan - Model Trainz
<kuid2:300193:100129:4> Chiyoda Branch Line
<kuid2:82412:104711:7> Season Town Northern RR
<kuid2:169264:100532:15> Warwick - Wallangarra
<kuid2:453099:100037:20> C&O Hinton Division
<kuid2:1854:1:12> Healesville - 1913-1920
<kuid2:154322:101483:23> ECML Kings Cross - Edinburgh
<kuid2:523:19723122:18> Kickstarter County
<kuid2:661281:200039:9> Kickstarter County 2 (TRS22)
Other payware routes used by route builders are from the 5-Pack bundle:
Trainz 2022 DLC - Settle and Carlisle
Routes are:
<kuid2:69379:100014:14> SnC Carlisle Skipton
<kuid2:69379:100008:11> SnC Craven District
<kuid2:368725:100050:15> SnC Ribblesdale
<kuid2:69379:100009:18> SnC Vale of Eden
<kuid2:69379:100020:17> SnC Yorkshire Dales