Do keep in mind that until the end of WW1 Poland was divided between three great empires, German, Russian and Austro-Hungarian so your grandfather, born 1895 was probably Polish (ski), by ethnicity and spoke Polish, but could have been Russian, German or "Austrian" by citizenaship/nationality at birth and could have any of the three passports. Depending on which part of "Poland" he came from he could have travelled by the "indirect route" (google) which meant a through ticket, train, ship, train, ship - from several Baltic ports - Libau (Liepaja), Danzig (Gdansk) or Memel (Klaipeda) to one of the UK East Coast ports - Grimsby (in particular), Hull, Newcastle or Leith. Most people travelling to North America continued to Liverpool or Glasgow, some did go to Southampton (one "h") but these were generally more for Australia or South Africa. The most important line for the Baltic stretch was the Wilson line which almost had a monopoly on the trade, but some people did travel through Hamburg, Bremen or Bremerhaven on other lines. Many of the North American destinations were served by Cunard from Liverpool. Might be worth googling "emigrant ships Liverpool" and see what turns up. As the population of "Poland" was very mixed if, e.g., his mother was German/German speaking his name could have been Friedrich, or I believe it is spelt Fryderyk if they spoke Polish, but either would probably appear as Frederick in English. Hope this is useful.