I agree with flyboy. DC transformers are pretty much standardized at 0-16 VDC, no matter when they are made. The exception is that some which are designed for larger scales have a higher max output.
Give everything a good clean and lube and see if that helps.
Connecticut Valley Railroad -- A Branch of the New York, New Haven, And Hartford
"We don't stop playing because we grow old. We grow old because we stop playing." --George Bernard Shaw