365 days of SL, day 114:
(Click for larger — 1920x1033 PNG, 2172 KiB)
When we visited Equino's Armory on day 111, we noticed that there was a road near by. Unfortunately, the parcels only said "Protected Land" instead of giving its name, but it was quickly established (with the help of this map) that we were on the Heterocera continent and standing on Route 4 (most likely; the SL wiki entry for Route 4 shows it stopping earlier, but since the actual road continues, there's no good reason to assume it's not Route 4 anymore here.)
(Click for larger — 1920x1033 PNG, 2036 KiB)
In fact, Heterocera seems to have a pretty extensive railway network, as seen e.g. on the official Heterocera network map (which may be slightly outdated); unfortunately, though, despite waiting for a while, we never caught or even so much as saw a train.
But there must be some; the track proper has some sort of invisiprim in the middle, presumably used for guiding trains, and it'd not make sense to have a railroad network with train stations and everything without trains, would it? Given that SL also has cars (including trucks and busses), planes, sailboats and more, there's no reason to assume it shouldn't also have trains. We'll have to catch one some time when we see one!
Location: Dubia (87, 243, 62) (SLRR Dubia Station)