I thought someone would have given you a reply by now but therefore I suggest you contact the sales reps. of Plasser American Corp. Chesapeake, VA at 804-543-3526.
Next try: Kershaw Manuf: at 334-215-1000
And Pandrol Jackson at 616-843-3431.
These companies are international dealers with many accounts in South America with narrow gauge as a common status. But none of their web sites specify any narrow gauge in evidence.