Hi John2002. I just bought 2019 Platinum, and after I did, I noticed they had given me a 2-day FCT with it. One way to pick up assets fast is to download routes. Even if you don't like the route in the long run and delete it, you still have the assets. However I think there are lots of good routes updated for 2019 that you will get a lot out of. You don't say if you are interested in Model railroads, so some are included below. There are some very good ones by philskene. Some very good 2019 (all version 4.6) routes are listed below:
ONE VERY LARGE CAVEAT: This list would easily be 3 times larger except for two things: 1. I did not include those I have with missing dependencies, as that is a lot of work, and 2. I did not include a LOT of outstanding routes from Europe, The UK, New Zealand and Australia, because you specifed the US and Canada. If you like I can recommend some highly recommended routes from those areas.
<kuid2:101046:105057:1> Cotton Belt Route Ver 1303.9.2 TRS2019
<kuid2:69871:3577:2> TRS19 - The Rivercide Electric Railroad Co
<kuid:73500:100153> Arkansas and Missouri Railway
<kuid2:439337:102423:2> Cattaraugus Creek & Lake Erie 1950s - TRS19
<kuid:289739:100183> Model Trainz - DRGW San Miguel Branch TRS19
<kuid:166065:101071> EMM Model Railway Layout FYNE FETTLE v1.1 TRS19
<kuid2:225098:100144:1> Robe River Iron Udated To TRS2019
<kuid2:289739:100208:2> Model Trainz - New Haven's Dorrville Branch TRS19
<kuid2:69871:3541:1> TRS19 - The Lilliput Logger - SG Model Trainz Layout
<kuid2:289739:100501:1> Model Trainz - The Out-And-Back TRS19
<kuid:289739:100190> Model Trainz - Thunder Valley & Midland TRS19
<kuid2:439337:104259:1> Wilsons Mills & Mount Olive - TRS19
<kuid2:439337:102147:4> Progressive Rail Jesse James Line - TRS19
<kuid:181290:100465> Rocky Mountains Montana Track New Era TRS19
<kuid:439337:104762> Roscoe, Snyder & Pacific - TRS19
<kuid2:73500:101289:1> San Diego and Arizona Eastern Railway
<kuid:439337:104190> The Loops - TRS19
<kuid2:69871:3536:1> TRS19 - The Hoofhearted & Smelz RRCo - NG Model Trainz Layout
<kuid2:69871:3516:1> TRS19 - The Klozett RRCo - NG Model Trainz Layout
<kuid2:69871:3522:2> TRS19 - The Lilliput Logger - NG Model Trainz Layout
<kuid2:69871:3498:1> TRS19 - The Mann, Phrom, Laramee RR - Model Trainz Layout
<kuid2:69871:3503:3> TRS19 - The Phootnote & Fourword Railroad - Model Trainz Layout
<kuid2:69871:3583:2> TRS19 - The Rivercide Railroad Co
<kuid2:69871:3539:1> TRS19 - The Yuan Gulch RRCo - NG Trainz Model Layout