The Vintage Traffic will replace the modern default
If you want to change back to the default
vehicles you will need to remove the kuids listed above from your TRAINZ install directory
\Program files \ Auran \ TRS2004 \ World \
Dispatcher \ downloads
If you do remove them remember to also
delete the cache file so that TRAINZ can rebuild it next time you load it.
\Program files \ Auran \ TRS2004 \ Cache