a $3,000,000 computer on long-term loan from Lincoln Laboratory.

At the club itself, a semi-automatic control system based on telephone relays was installed by the mid-1950s. It was called the ARRC (Automatic Railroad Running Computer). It could run a train over the entire set of track, in both directions without manual intervention, throwing switches and powering tracks ahead of the train. A mainframe program was used to compute the path, and all modifications to the layout had to be compatible