Jebwabne was in Lomza Gubernia in NE Poland. This was close to Konigsberg in East Prussia on the Baltic, but other routes were possible e.g. via rail to Hamburg or via Latvian ports. It was common for sailing ships to go from this area to Hull in England and then a train was taken to Liverpool to go onto America. My ancestors came to UK in 1860s and 1870s from the Suwalki Lomza gubernias likely via Konigsberg. They came by sailing boat. But by the 1880s much faster steam ships had come into operation for both the Baltic and Atlantic routes, and this made travel cheaper as well as faster.. The University of Hull's website has a lot of info on the sailing routes. 

Jill Whitehead, Surrey, UK