Let me first start with an introduction, I am Jay Ferraro your great uncle! Son of James Ferraro who is one of Samuel Ferraro's brothers.
You are very close with your information about your great grandparents (my grandparents), but here are a few facts to help you. "Great Grandfather" Giuseppe(Joseph) Ferraro, born in Cicciano Italy in the year of 1888, Son of Michele Ferraro and Louisa Coppola Ferraro. "Great Grandmother" Teresa Mascucci Ferraro, born in Avellino, Italy, daughter of Philipo Mascucci and Girarda LoPrior Ferraro.
Michele Ferraro came to America with Giuseppe in 1903, Teresa Mascucci came to America a few years later. Giuseppe Ferraro did work for the railroad building railroad cars.

If you need anymore information, you can contact me at jayf@daleco.net. Myself and some of your other great uncles have built a family tree on this site.