It looks like a fun project. I did notice something odd in the example on your github page: $ tubemaps path --from "Euston" --to "Hammersmith" # Piccadil

It looks like a fun project. I did notice something odd in the example on your github page: $ tubemaps path --from "Euston" --to "Hammersmith" # Piccadilly Line: Hammersmith to Barons Court # Piccadilly Line: Barons Court to Earl's Court # Piccadilly Line: Earl's Court to Gloucester Road # Piccadilly Line: Gloucester Road to South Kensington # Piccadilly Line: South Kensington to Knightsbridge # Piccadilly Line: Knightsbridge to Hyde Park Corner # Piccadilly Line: Hyde Park Corner to Green Park # Victoria Line: Green Park to Oxford Circus # Victoria Line: Oxford Circus to Warren Street # Victoria Line: Warren Street to Euston It may just be me, but it seems you have "from" and "to" reversed? (NOTE: Trusting my judgement on such directional things tends to be a bad bet since I'm ambidextrous and dyslectic --I don't know left from right, and for me, it often doesn't matter. ;)