| Station | Location | Railroad |
|---|---|---|
| Assembly | Somerville, Massachusetts | Massachusetts Bay Transportation Authority |
| Davis | Somerville, Massachusetts | Massachusetts Bay Transportation Authority |
| Fitchburg Crossing | Somerville, Massachusetts | Boston and Albany Railroad Company The New York Central Railroad Company |
| Lowell & Fitchburg Junction | Somerville, Massachusetts | Boston and Albany Railroad Company The New York Central Railroad Company |
| Prospect Hill | Somerville, Massachusetts | Boston and Maine Railroad |
| Somerville | Somerville, Massachusetts | Boston and Maine Railroad Fitchburg Railroad Company |
| Somerville Highlands | Somerville, Massachusetts | Boston and Maine Railroad |
| Somerville Junction | Somerville, Massachusetts | Boston and Maine Corporation Boston and Maine Railroad |
| Union Square | Somerville, Massachusetts | Boston and Maine Railroad Fitchburg Railroad Company |
| West Somerville | Somerville, Massachusetts | Boston and Maine Railroad |
| Winter Hill | Somerville, Massachusetts | Boston and Maine Railroad |