Just Who are the Thomas Manufactuers

Ok...  for me, this is getting twisted.  So let me simplify my question:

In 1992, who was the manufacturer of the plastic battery Thomas line in:

UK - ?
US - ?
Japan - ?

In 1992...

UK - TOMY with the TOMY Trains range
US - TOMY with the TOMY Trains range
Japan - TOMY with the Plarail range

Hope it helps.