Louis,
Actually, in detail, the Bessemer 2-10-4 no. 643 more closely matches the last 6 Q 2-10-4s, nos. 6322 - 6327, built in 1929. Both locomotives included the slanted front cab wall (as opposed to the rectangular shaped cab sidewall on the first 12 locomotives) and, as originally built, had one sand dome in front of the steam dome and one to the rear. No. 643 remains configured that way while, the Q relocated the rear sand dome on their 18 locomotives between the front sand dome and the steam dome, as seen in your attached photo. In addition, no. 643 has a welded tender in place of the riveted tenders on the Q locomotives with a slightly different shaped coal bunker. Here is a link to the Age of Steam website showing some of the work already being done.
Bill Barber Gravois Mills, MO
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