Now the 152/153 story is the same as the 701/706 story. Why have 2 locomotives with the only difference being that one is reversible. When the 150 series came into being in 1917 the 701/706 became just the 154. Why carry 2 locomotives for only 2 years? Just upgrade, if you feel you must, the 152 to a reversible loco. Then you don't have to inventory two of basically the same thing. They still had the 150 for their low end / beginner outfits. Same motor with the same power as a 156, just in a smaller body. Left over 152's could be sold separate or in outfits to wholesalers which I'm sure they did with all old stock (or send it to Madison Hardware!). The reverse arm on a 153 was probably not a cheap part to produce. It had to be clinched on one end and punched to make the head that keeps the arm in the hand reverse unit. It also has to be threaded on the other end and go through a series of 3 bends. Don't forget about Nickel plating. And then there's the knob/thumb nut. Mike (not Jim)