Here is a link to the photos that Scott has told us about. Notice the transverse-mounted AB reservoir.

https://nycshs.omeka.net/search?query=nhix&query_type=keyword&record_types%5B%5D=Item&submit_search=Search

I still don't know if it's justifiable to have more than one of these cars since I'm not sure if they tended to travel in groups of more than one on the NYC.

-Phil