Dreyfuss Hudson serial #'s

I am a engine or loco artist. I am currently completing a painting of the Dreyfuss Hudson J3a (2nd set 1938) number 5450. I know she was ALCO built and assume built in Schenectady (not sure). Could you please provide direction to a website which will provide the ALCO serial number for 5450 and if possible the date on the builders plate?

From the New York Central System Historical Society steam locomotive book Vol. 1.
The Alco-S no. is 68884 and the date is April 1938.

Steam Locomotives of the New York Central Lines, Volumes 1 and 2 by William D. Edson and H. L. Vail, Jr., assisted by Edward L. May. The ultimate authority on all steam and electric locomotives from the DeWitt Clinton of 1831 to P&LE 9406 of 1948. http://nycshs.blogspot.com/search/label/books

Thank you sooo much! Sincerely, Nina