this post was submitted on 30 Nov 2025
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I wonder how fast we could get a steam train to go if we stuck a suitably shaped non-critical amount of plutonium in the firebox.
Non-critical? There isn't much energy released from natural decay compared to criticality. We created things like this to power space probes like the Voyager I and II craft. 4.5kg of this Plutonium created about 2500w of thermal energy the the beginning of its life and the power declines from there.
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So I need 80 tons of it in my firebox?
Well, you'd then have another problem. Unlike coal/wood/oil fuel, you can't turn off radioactive decay.
You'd have megawatts (gigawatts?) of thermal energy boiling off all your water pretty quickly, and likely eventually melting down your steam engine firebox, and it would be that hot for decades!