One thing to note, many mid-1800s 4-4-0s (and some other types of that era) did have blind drivers on the first axle. The B&O #25 "William Mason" is one such example. The lead truck simply pivoted as any other truck would about one axis and wouldn't have had the lateral motion swing links that later locomotives acquired as technology progressed, therefore it kept the front end of the locomotive on the rails. The blind drivers were typically wider than a flanged driver as well to prevent issues such as what the models described above are experiencing.
It appears that the replica 119 and Jupiter locomotives have flanged drivers on both axles, but perhaps some reference was found to say the original prototypes did not?
