You can uninstall or removes an installed bve-train-br-class-323 package itself from Ubuntu 16.04 LTS (Xenial Xerus) through the terminal,
$ sudo apt-get remove bve-train-br-class-323
If you would like to remove bve-train-br-class-323 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove bve-train-br-class-323
If you use with purge options to bve-train-br-class-323 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge bve-train-br-class-323
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove bve-train-br-class-323