Question: Pan Am Railways has a subsidiary in which former US Class I railroad in Maine?
Sentence (from "Pan Am Railways"): The primary subsidiaries of Pan Am Railways are Boston and Maine Corporation (reporting mark BM) , Maine Central Railroad Company (reporting mark MEC) , Portland Terminal Company (reporting mark PTM) , and Springfield Terminal Railway Company (reporting mark ST) ; BM and MEC are operated under lease by ST.
Relevant evidence: Yes