Mellotronists

A topic-relevant trivia question:

Was the studio version of Led Zeppelin's "The Rain Song" recorded as 
a live-performance two-handed keyboard part, or was it multi-
tracked?  If it was actually played two-handed, was it ever played 
that way live?  The DVD version I just saw was audibly just 3-violins 
on an M400, but they did take the big twin-keyboard monster (Mark V, 
right?) on the road as well, didn't they?  Is that the machine on the 
studio version, or was that a Mark II?