I've had good luck using a fine tip white or yellow paint pen to put in road lines. For a straight section, I just measure to the center and use a ruler to guide the lines. For curved roads, you can cut some thin cardboard to the correct radius and use the edge to draw the lines - also works for the edges of the roadway.
For a pole transformer, I've used a large capacitor, like 160v, 68uf, and painted and weathered it. It has two wires sticking out on which you can glue small green/maroon glass beads to resemble insulators. You can also use the small, barrel-shaped dessicant cannisters that come in a variety of products to keep the m moisture-proof.
