There are two photos the Tuohy-McComas archives book. The mechanism was simple, a loop that fit over the drawbar connected to a pivoting bracket the engineer was on. When the locomotive went into a right hand curve, the engineer leaned out of the window. Of course, the figure would go further inside on a left curve.
According to T-M, the Lionel engineers determined action was too small to be seen easily.
Rusty
