(a) Maintenance-of-way equipment (including self-propelled maintenance-of-way equipment) described in § 215.3(c)(3) shall be stenciled, or marked—

(1) In clearly legible letters; and

(2) In accordance with paragraph (b) of this section.

(b) The letters “MW” must be—

(1) At least 2 inches high; and

(2) Placed on each side of the car.