I actually prefer to have everything that has "BN" included (I hate editing Asset names. It makes things way too confusing when dealing with other people), because that way I get both the "BN F7-Clean #306" and the "EMD SD-40-2 BN #4832" and the "Auto Carrier 1970's #7482945 BN" all in one list, and I just have to troll for them. If I'm looking for "Category-Locomotives" Ill add that as a parameter or Rolling stock as well, which makes the lists fairly small anyway.
Falcus