overheard on the T

[dad, son, and daughter on the orange line, looking out the window between sullivan square and community college]

son: dad, look at those trains from the olden days... i've seen those in wisconsin.

it might just be me, but i found it funny. first, i think referring to "the olden days" is humorous. it reminds me of elementary school. second, what is the correlation, if any, between "the olden days" trains and wisconsin?