09-09-2013, 03:12 PM
Not too modern at all, Kevin, as the cast Andrews truck was introduced in 1898. Its big advantage was that it could utilise the journals from older archbar-type trucks. The Bettendorf Axle Company originated the cast one-piece truck sideframe in 1903, so they would've been in use within your time period, too, although it's difficult to say which narrow gauge roads might have used them.
Wayne
Wayne