TRS19 stores content data separate from the Trainz installation, not like the earlier versions. TANE has introduced this system.
Usually TANE / TRS19 stores user content in the local folder. The default location is C:\Users\<Computer username>\AppData\Local\N3V Games\trs19\build XXXXXX, which still might have your content at.
If you have another folder that TRS19 stores your content, it'll be at that location you pointed TRS19 to.
Cheers