I like work trains.
Your design looks a little like pumped-up version of this:
A similar concept from across the pond:
Could this be a starting point for a kit-bash? (It's already the correct color!)
"It is one of the happiest characteristics
of this glorious country that official utterances are invariably
regarded as unanswerable."
-Sir Joseph Porter, First Lord of the Admiralty (HMS Pinafore)