Why Railroads Were Built Alongside Canals

Complementary Transport: Rails & Canals in the 19th Century

Railroads often paralleled canals for seven practical reasons:

1. Shared geography: Both followed river valleys, low grades, natural corridors.
2. Intermodal transfer: Canals for bulk/heavy; rails for speed/perishables. Transfer points (e.g., Erie Canal ↔ NY Central Railroad) created hubs.
3. Seasonal complement: Canals froze in winter; rails ran year-round.
4. Congestion relief: Canals bottlenecked at locks; rails offered parallel capacity.
5. Competition & synergy: Some railroads bought canals to control rates; others partnered for through-bills of lading.
6. Market access: Canals served existing towns; rails extended reach inland.
7. Land availability: Canal rights-of-way often included adjacent land for rails.

Historical Examples

• Erie Canal + New York Central Railroad.
• Chesapeake & Ohio Canal + B&O Railroad.
• Pennsylvania Main Line (canal + rail hybrid).

Outcome

Rails ultimately superseded canals for most freight by 1900 (speed, reliability), but many canals survive for bulk, recreation, water supply.