Here's a closer view of the trams.
The message is very sweet:
April 5 -1910
My Dear little Boy -
Tell Mamma that Aunt Trey (Tray?) got her letter yesterday and will write her next Sunday. I was so glad to hear all the nice things about you and so happy to hear in her other letter that you could say my name - Don't forget it, please - It is just four months today since I saw you last. I stole upstairs and you were asleep in your little bed. How do you like the looks of these two-story cars? Not so much as your own new "chu-chu" car I know. Wish you bring it over to take me riding. Kiss Mamma, Papa, Aunt Kate, Elizabeth, W___, Aunt Ida for me, and tell everyone to compliment you.
Lots of love from Aunt Trey