You will need:
A piece of red paper (or white paper painted red) about the size of half a postage stamp
Similar pieces of white and black paper, but these must be coloured white or black all the way through
A white bristle from a scrubbing brush
Scissors, glue, and a punch to make holes 1/16" (about 1.5mm) in diameter (or the patience to cut out tiny circles)
Optional: For method 1, a piece of wood about 1/16" x 1/8" x 1/4" (1.5 mm x 3 mm x 6 mm), and a piece of red paper a little wider than 1/16"' (1/5 mm) amd about an inch long. You can try out different sizes--see below.
First, make a sandwich with white paper as the bread and black paper as the jam. Leave to dry, then punch out at least four 1/16" diameter circles. These should look like wheels. Mark the centres in black.
For the wagon itself, there are two method. In both cases exact measurements are not important.