A question was recently asked by Chris Sweryda about the black composition insulators marked "CEECO", I remember commenting that there were at least two styles of that insulator; well, here is a picture of the two (plus a third style): "CEECO" on the left, "LW" in the middle, and the CD 154 style. Although it does not show up very well in the picture, it is probably the only MLOD "CD 154" there is.