I have a very small (5 engine) fleet of PW steam, and in spite of the fact that there is a lot of information out there about how to date these trains, I'd like to ask this question.
The (plastic/bakelite?) brush holders on mine are as follows:
290: black
300: dark brown
310: light brown
302AC, 312: black
Is there a rhyme or reason to this, and does the color help in dating these? Judging by what I've learned so far, I would guess the "black" holders came later in production.
Mark in Oregon