I purchased a model of a Boston and Maine E7 13 years ago. It was my first N scale Boston and Maine loco, and my collection has since grown. I've always wondered, on what lines were these principally run? I realize that might be a huge question. I tried looking, but if this has already been posted somewhere, let me know.
Your question is ambiguous..
Do you mean:
"On what Boston & Maine routes (lines) were Boston & Maine E7 locomotives used?"
or
"What railroads (lines) used EMD E7 locomotives?"
Scot