Product #s for Early Spectrum DC Rock Island 2-8-0s?

[Searsport]

Hi, I am confused by Bachmann product numbering. Walthers website says Bachmann Spectrum 11418 was Rock Island 2-8-0 #2121 "These DCC-ready, ready-to-run models feature a five-pole skew wound motor, belt/flywheel drive, all-metal chassis, no traction tires, metal side rods and metal wheels under the tender with pickup." Problem is somehoscalemodelsgi.com has Spectrum 11418 as RI #2008, and indeed I have #2008 in a box labelled Spectrum 11418, which I assumed was a loco in the wrong box as I also have RI #2121 in a box labelled Spectrum 11418. Now I have encountered Bachmann Spectrum 11418 Rock Island 2-8-0 #2119. bev-bel.com lists Bachmann Spectrum 11418 Rock Island 2-8-0, but does not specify a road #. Did Bachmann use the same Spectrum 11418 # for all of their early DC, DCC ready Rock Island 2-8-0s? If so, how many road #s were there under this same product #, and which am I missing?

And do all of these models have a bulb which needs to be changed to an LED if fitting sound? I ask because I got some sound-ready USRA medium coal tender chassis from the spares shop.

Grateful for any info,
Thanks,
Bill.

[Searsport]

BTW I should have added that I do know that a DCC fitted version of RI 2-8-0 #2119 appeared as Spectrum 83606, and also as the loco in Bachmann 01125 "The Frontiersman Rock Island Freight Set".

Thanks,
Bill.

[Len]

Bachmann isn't the only one that's had "duplicate" item number issues. If you look at loco ads over the years, you'll often see an item number for a particular loco type, with a blurb after it saying something along the lines of, "Specify road name when ordering".

Len