What position should the coupler control lever be in between the PA-4 work car and flat?

The correct position for the coupler control lever between the PA-4 work car and the flat is the uncoupled position. In this position, the coupler is disengaged, allowing the two vehicles to be separated safely without any risk of unintended coupling or movement.

This setting is crucial when maintenance or operational tasks require the independence of the work car and flat, ensuring that if adjustments or transfers are being made, there is no accidental engagement of the couplers. Properly utilizing the uncoupled position is essential for safety and operational efficiency, as it allows personnel to work between vehicles without concern for movement caused by coupling forces.

The other options represent positions that would not serve the current operational needs: 'coupled position' would keep the vehicles connected, 'locked position' typically secures the coupler but still retains a connection, and 'free position' may suggest a state of readiness for connection but does not indicate separation. Therefore, for safe operations between a PA-4 work car and flat, the uncoupled position is essential.