I'm not sure your site belongs in a business category.
Yeah, I wondered about that for a while, flipping back and forth between
Recreation/Trains_and_Railroads/ and
Business/Transportation_and_Logistics/Urban_Transport/ .
The former seemed to me to be oriented towards "real railroads," although now that I look at the Personal Pages subcat again, I do see some subway-oriented sites.
On the other hand, the Urban Transport category does have a number of enthusiasts' sites, for example under
.../Urban_Transport/Tramways_and_LRT/ and
.../Urban_Transport/Transit_Systems/Subways/. Also, at the top level of
.../Urban_Transport/Transit_Systems/Regional/ there are a couple of sites that have the same basic concept as mine, but are international in scope whereas mine is (so far) focused on the United States.
I'm not an editor, of course (although I'm seriously thinking of applying to become one), but if I were one, I'd propose putting all the transit enthusiasts' sites somewhere under Recreation, either as a subcategory of Trains and Railroads, or as a parallel Recreation/Urban_Transport (because there are sites that are oriented towards urban buses as well as rail).