like a straight (right) line
51Zürich–Olten railway line — Spanisch Brötli Bahn locomotive in 1867 Legend …
52Northern City Line — Overview Type Commuter rail, Suburban rail System National Rail …
53Circle line (London Underground) — Circle Colour on map Yellow Year opened 1884 Line type Sub Surface Rolling stock C Stock 6 carriages per trainset …
54North Clyde Line —      North Clyde Line A Class 334 crosses the River Leven between Dumbarton and Dalreoch …
55New Guildford Line — Overview Type Suburban rail, Heavy rail System National Rail Status Operational Locale Surrey South East Engl …
56Nankai Kōya Line — Limited Express Rinkan Technical Line length 64.5 km Track gauge 1067 mm …
57Gold Line (Los Angeles Metro) — Metro Gold Line      Los Angeles Metro rapid transit line …
58Northern line — For other uses, see Northern Line (disambiguation). Northern Colour on map Black Year opened 1890 Line type Deep Tube Rolling stock …
59IRT Flushing Line — The 7 and 7 Express trains serve the entire IRT Flushing Line at all times Overview Type Rapid transit …
60Far North Line — Overview System National Rail Status Operational …