You can clear a substantial amount of space by clearing out the following locations:
Your data folder for TRS2019-Platinum /Cache/Internet
Backups. Delete all but the last couple of days. You can then set this to a smaller amount of days (days started up not consecutive days) by clicking on the Dev tab in the settings on the Launcher.
Yes putting the data on a bigger hard drive is recommended and you can do that after you cull out the garbage.
John
Trainz User Since: 12-2003
Trainz User ID: 124863
T:ANE Build: 94829
TRS2019/Trainz-PLUS: 109641