I have the whole set, except #16 and 17 which are on order with Karen's Books. A lot of the earlier ones are out of print now.

I'm amazed at how long he's been putting these out. Vol. 1 on Fairbanks-Morse Locomotives published in about 1992. How many more does he plan to put out? What's left?

Given all the single volume books, in which future planned volumes were never published, I'm really impressed at this series. Remember the planned set of SP Diesel books from Chatham Publishing Company in Burlingame? They did exactly one volume, the PA's, and never did another. Same with Four Ways West. They have numerous Volume 1s (DRG&W, MKT, ATSF, etc) that state in the introduction that there will be future volumes, in which I'm pretty sure Vol. 2 will never happen.