The Burlington Northern was created through the merger of 4 railroads:
The Chicago, Burlington and Quincy Railroad
The Northern Pacific Railway
The Great Northern Railway
The Spokane, Portland and Seattle Railway.
BNSF route map. Mainlines of the 4 railroads comprising the 1970 merger can be seen on this map.
The Burlingtons featured in the previous post. The Great Northern and the Northern Pacific were both controlled by James J. Hill but were never fully merged. The Great Northern was Hill's creation and was built carefully, building business and settling populations as it laid it rail. The NP was built in greater haste with a view to reaching the Pacific quickly. It became a financial drain and remained so for years.
Logo for the Northern Pacific Railway. I have no image of any Northern Pacific cancels. If anybody can help me with one, please let me know.