Thought I'd draw your attention to an article in the Vol. 31, Issue No. 4 of Milepost (published by the Friends of the PA Railroad Museum). The Curator's Corner column (author Allan C. Martin) discusses a safety device called the Wrights Little Watchman. The device is mounted on a bracket on the front pilot beam and is connected to the air brake system. If the front truck derails, it throws the locomotive into emergency.
Anyway, the article describes the device at length and some of the correspondence between the museum and the Fort Wayne Railroad Historical Society. Apparently, the device exists on both locomotives.
Perhaps someone more knowledgable (Rich?) can comment.
George