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Let's go from this...
...to this!
And actually, this is already waaaaay out of date. Sophie is now 
outfitted with hi-tech Lithium Iron-Phosphate batteries that are
computer controlled and mounted entirely inside the locomotive.
The tender that used to carry all that messy bulk you see in the
pictures above is now EMPTY (except for the driver and the 12V
system battery). Sophie can now pull trains for up to 3 days on a
single charge!

This drive system has become the development prototype for
new 24-inch gauge park and zoo locomotives now being built by
Texas Bells and Whistles. Keep your eyes open for many of our
new electric locomotives pulling trains across the country soon!