Thanks Ben
It seems to be the E-unit. It does not change speed either with the smoke unit engaged or disengaged.
The motor runs faster with a Williams E-unit hooked up (and the Lionel one disconnected) and does not slow down when the smoke unit is engaged and powered up.
Unfortunately, the Williams E-unit will not fit into the boiler.
I might be able to make a Dallee E-unit fit, or maybe I can buy a new Lionel E-unit that will work properly.
Unfortunately, the E-unit is $35 on the Lionel site.
691DREUA03 | REVERSING & DRIVE PCB REV3 | 28 | $35.00
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Bleah!