These subjects of several paintings by Gino Severini also often appear behind long red-brick walls in works by Giorgio de Chirico, like The Uncertainty of the Poet and Gare Montparnasse, which depicts a station for them.
At the bottom of a landscape named for one of these objects, a row of white curves is separated by a tree from a set of angles and lines. In that painting, a village and the fields are depicted as a tumbling array of colored geometric sections below one of these objects, which is marked with the flags of France and the Red Cross. In another of these objects, a group of faceless blue-cloaked figures crouch under a cannon and aim their rifles. A frontal view of one is visible through the leftmost arch of an arcade in The Anxious Journey, while another appears in the distant background of a painting depicting a classical bust next to a (*) bunch of bananas. These subjects of several paintings by Gino Severini also often appear behind long red-brick walls in works by Giorgio de Chirico, like The Uncertainty of the Poet and Gare Montparnasse, which depicts a station for them. For 10 points, name these long vehicles that spew clouds of smoke in many paintings, including Monet's Gare Saint-Lazare. 
At the bottom of a landscape named for one of these objects, a row of white curves is separated by a tree from a set of angles and lines.
trains [accept synonyms]