one silly thing about SA136: according to Wikipedia (so this might as well be absolute fiction to be fair), theoretically (polish?) SA136 and SA139(better known as Pesa Link/RegioShark) can be coupled and used in revenue service, yes, these two critters, myself i am quite sceptical of that given all problems around coupling Pesa units, and since these are two different generations, i am even more sceptical of that