Franklin Roosevelt signs legislation authorizing first US peacetime draft in 1940 in Washington, DC

The transcript discusses the transformation of recruits into a fighting force and the introduction of the first peacetime conscription bill by President Franklin Delano Roosevelt on September 16th, 1940. It also highlights the reactivation of machinery that had been unused for a long time.

What does the phrase 'the machinery rusted' imply about the state of conscription before 1940?

What happened to the machinery that was previously used for conscription?