Blue LEGO Duplo train set with tracks

I lost my blue LEGO Duplo train set yesterday around 3pm near the Worcester Public Library on Main Street. It's a big blue and red plastic set, with a small yellow caboose and a brick that has a tiny sun sticker on it. The engine is about 4 inches long and the full track layout stretches to roughly 12 inches when laid out; I think a few straight tracks are missing now. This set means a lot to my kid—it's a gift from my mom—and I'm really hoping someone picked it up and can reunite it with us.