I had no idea that The Brave Engineer was edited......nor have I seen it, for that matter.
For my birthday, one of my aunts got me the Disney Rarities DVD, although it hasn't arrived yet; up until then, the only two things I could clarify were edited out were the original title sequence (of course the "cards" on the screenshots aren't original, there's no RKO references on them) and, according to the database, "a scene featuring train robbers brandishing guns and knives" (could this have been a later television edit?).