Dante, the very last correspondence I had with Ellis involved this subject. I am trusting to recollection only as I write this, but I thought his question had to do with piping from the steam dome of one of the locomotives. I sent him a photo of (I believe Monson no. 3's) steam dome, which showed proper (code) piping arrangement. I cannot imagine a radiator valve being substituted for a throttle, passing muster with an inspector. Would such a radiator valve work? Perhaps...