if it hasn't to be S I recently bought a toy train for 20 Euro that runs on 0 gauge, but otherwise looks very smallish, like S
Western style
loco, tender, 2 coaches, coal wagon
RC, light and sound
still a lot on ebay
google Goldbären express
only flaw is that the plastic is a bit soft - so I don't know about glueing yet
but otherwise a bargain