Main Street is the principal north-south street through Belen, connecting to the two I-25 exits on both ends of town. Traveling further in either direction, Main Street becomes a state highway running parallel to I-25. Reinken Avenue is the main east-west road through Belen, starting at Main Street and running east over the railyard, crossing the Rio Grande, and ending at a north-south state highway connecting to places across the Rio Grande.
There's no public transportation in town. However, parts of Belen are quite walkable, especially the "downtown" area along Reinken Avenue between Main Street and the railyard, which is where you'll find most of Belen's historical structures. It is also within walking distance of the Rail Runner station.