- Prototype - Where a modeller may go to great lengths or extremes to replicate an exact scale model of a particular prototype railroad. Sometimes known in the modelling community as a "Rivet Counter".
- Freelance - A model railway that has no known prototype
- Proto-lance - A combination of both of the above, where the model is based on part or parts of an actual prototype, but itself did not actually exist.
Allow me to explain with a brief history lesson. Sir William Mackenzie and Sir Donald Mann were expanding their Canadian Northern Railway (CNoR) system across Canada, and by June 1901 had built 60.5 miles of railway line northward, along the coast of the Northumberland Strait from Port Hawkesbury to Inverness; Cape Breton Island, Nova Scotia. Due to financial difficulties at Canadian Northern, the Canadian National Railway first leased the line from February 1, 1924 until June 1929, when it purchased it outright.
Under CNR ownership, this stretch of track was known as the Inverness Subdivision.