Check the back of the box for copyright dates–there won’t always be one but if there is, it’s probably near the firm’s address or patent data. If there’s a zip code, it dates from later than 1963.
If it has three rails and no imitation cross-ties, it’s probably a Lionel.
If it uses any plastic, it’s going to be a post World War II release. (I’m not sure about how early Bakelight would have been used, if at all.)
If it has photographs on the box showing the set in action, happy kid under Christmas tree or that sort of thing, it is almost certainly later than the mid-1950s, when Tyco sets and such were marketed to self-sell; that is, they sold more as impulse purchases at toy or department or discount stores than as “carefully considered purchases” from a hobby shop.
If the “1919” is stencilled anywhere on the locomotive, that’s just a historical detail, not a release date.
If it’s a freight set and the locomotive and caboose belong to different railroad lines (Santa Fe vs. B&O, say), then the set was definitely marketed toward kids. Real adult hobbyists are driven to distraction by that kind of mixing because it almost never occurred in real life.
I agree with the earlier post about the durability of Tyco trains. Obviously, the kits weren’t up to the standard of hobbyist equipment, but they sure ran better HO than the later Bachmann or Life-Like IMHO and experience.
You could probably avoid all this sleuthing by taking a picture of the box front and back or of the set laid out on a towel, digitizing the image, and posting it back here.
It’s best to assume you have something worth hanging on to unless experience tells you differently.