The Railway is really the only attraction in Porto Velho, so you should visit it if you ever find yourself in this town that feels like the end of the world. Named Mad Maria, it is the subject of a novel of the same name by Manaus author Marcio Souza and was an integral link in the the rubber trade. Now the railway is defunct and even the small museum has fallen into disrepair.
There are some exhibits to see, however, and the overgrown grass around the abandoned locomotive gives it a certain enticing sense of having been long-forgotten. Once you've seen what there is to see, take a walk along the line. It runs parallel to the Madeira river and is a calm and peaceful spot. There are a couple of quiet restaurants and places to have a cool soft drink.
Av. Carlos Gomes 1616, Porto Velho, BR