Crosby Lake is a large lake that is situated on The Main Line.
In the seventeenth season episode, Gordon Runs Dry, Gordon was seen passing by the lake whilst pulling the express. In The Adventure Begins, Thomas was also seen passing by the lake whilst pulling Annie and Clarabel, while some ducks were swimming in the lake.
The lake appears in the seventeenth season and The Adventure Begins. Starting with the nineteenth season, it has appeared in the intro of the series.