Fireless Locomoteve can use all steam types

This will allow them to use byproduct stream from arc furnaces and 3x FBRs.

Too complicated, low-steam would have been too weak to move locomotive and has much lower energy stored. Super steam may be too hot to be stored effectivelly and also train would have to be able to switch fuels, which currently no other locomotive can, so it would need special mechanics for just this. Yes, super-steam fireless locomotive could be added, but it is really that good? You can just make hydrogen from super-steam...