The contract called for final assembly to be in the USA, so the trains are being assembled in the USA with parts made by Stadler in Switzerland, Poland and USA.
I had been hoping that Stadler would be among the contenders for the Montreal REM train system. Kiss or Flirt type trainsets could have been operated using the existing rails, tunnel and stations. Especially seeing how the Caltrains design have doors for both raised and ground level platforms.
Instead, they chose a model derived from the Alstom Metropolitan series, which IMHO has not been proven in a climate like Montreal's.