Railway

Answer :
This little puzzle may be solved in as few as nine moves.
Play the engines as follows: From 9 to 10, from 6 to 9, from 5 to 6,
from 2 to 5, from 1 to 2, from 7 to 1, from 8 to 7, from 9 to 8, and
from 10 to 9.
You will then have engines A, B, and C on each of the three circles and
on each of the three straight lines.
This is the shortest solution that is possible. 
