The New York City Subway's "money train" was a specialized train used to collect and transport cash fares from stations throughout the city to a central processing facility. Introduced in 1951, the armored train was a crucial part of the subway's operations, ensuring that the vast sums of money generated from passenger fares were safely secured and transported. The train operated throughout the night, making multiple stops at stations to collect money bags from ticket machines and booths. Armed guards accompanied the money, and the train itself was equipped with reinforced compartments and security measures. In 2006, the introduction of MetroCards and the phasing out of token-based fare collection rendered the money train obsolete. The last money train service ran in January 2006, marking the end of an era for this iconic part of the subway's history.