Hi Roseanne Frank , I enjoyed Hop On Board! Transportation theme books are ever-popular with toddlers and I love the sounds and interactions you've added into this one.
I love ending with a block party! Parties are always exciting. However, I wonder why they needed to take a bus to go to a block party. Usually block parties happen within a short walking distance. Is there another ending that would feel equally satisfying? Perhaps a street fair further down the line? Maybe you could research events that happen on Broad Street in Philly or nearby?
I love the energy of this story, and a child isn't likely to have any logical issues with the destination. I think it would even stronger if the adult reading it wouldn't have any potential logical hang ups!