Hidden near the Wingwall of a Toronto, Hamilton & Buffalo Railway Bridge that was demolished sometime in 06-07, the tracks once ran vertically across Smithville, crossing over the top of Highway 20, now St Catharines Street, similarly some of the Wingwall for that demolished bridge still exists too!

Train going across the 20 Mile creek on the now-demolished bridge.
You will be looking for a small-ish plastic jar, there's room for some trinkets.
There's a trail leading to the cache area that starts at the end of the soccer field closest to the creek
Please place back everything as found, happy caching, and check out my other cache if you like bridges.