It looks like the boiler now has molded on detail.
Thanks for the heads-up about the molded-on detail. I have looked more closely at the photos and see you are right. What a pointless retrograde step, especially as the DCC ready ones are priced at $299, which is hardly cheap. And presumably the old molds are now irretrievably altered, so there is no chance of seeing the high-grade variant again. I was about to buy the B&O and T&P models, but now can save myself the money. Fortunately like you I have 3x low boiler + 2x high boiler of the old DCC ready unlettered variety. Those old low-boiler models also come with an optional wood cab.
I was also contemplating the UP version. Bachmann's original UP pair, UP#1584 and UP#1585 (respectively Spectrum 82303 (DCC Ready) + 84903 (DCC + Sound) were acceptably close to a small class built by Baldwin in 1907-10 which the UP inherited in 1936 from the Pacific & Idaho Northern Railway and included in its Oregon Short Line subsidiary / division, and which lasted until 1946-47. They were numbered 1584-7 and three were coal burners with 56" driving wheels. The exception was 1585 which had 61" drivers and was an oil burner, but Bachmann make an oil bunker for the small Baldwin tender, which can be found as an optional part in the undec Baldwin Modern 4-4-0 model, if you have one.
I have not tracked down UP 1429, which is Bachmann's new 4-6-0 offering. It may be a loco built by Rhode Island in 1890 for the UP, which was re-numbered to 1225 in 1915 and retired 1926. This was one of a class of 12 (class T-57), built with 62" drivers and re-built with 57" drivers some time after 1911.
Anyway, the point is that the Spectrum UP low-boiler 4-6-0 was a respectable representation of a real class of UP 4-6-0s that operated on their Pacific North-West branch lines until the mid-1940s - mountains and pine trees!
End of Ramble,
Happy Railroading,
Bill.