It is uncertain exactly when tractor rides began. It is logical to assume that it was after the stagecoach was taken out of service in 1977. However, the photo below is from 1964 which means that tractor rides began much earlier, and concurrently with stagecoach rides.

This is the original tractor car in the Peewee unit area:

In 1963, beside the T-Learner,

A larger car was built around 1982:

Jerry (Laidlaw) driving:

Lou Glait driving while visiting in 1983:

Dominic driving: