Function MakeTrainBackup

src/train_cmd.cpp:875–878

* Make a backup of a train into a train list. * @param list to make the backup in * @param t the train to make the backup of */

 * @param t    the train to make the backup of
 */
static void MakeTrainBackup(TrainList &list, Train *t)
{
	for (; t != nullptr; t = t->Next()) list.push_back(t);
}

/**
 * Restore the train from the backup list.