Bitcoin is both a currency (monetary system) and a software program. Introduced in 2009 as open-source software, Bitcoin is the first decentralized digital currency. It is decentralized in the sense that is has no regulatory authority such as a central bank.
A funicular railway or incline railway is a short railway located over a steep incline and operates by a cable wire and pulley system in which two tram-like cars on parallel rail tracks almost counter balance each other. As one car goes up, another goes down.