Probably because they planned a date to stop manufacturing radar cars, and may not be able to easily push that date back. They may have cancelled contracts, bur

Probably because they planned a date to stop manufacturing radar cars, and may not be able to easily push that date back. They may have cancelled contracts, burned down supplies, re-tooled production lines etc. Or perhaps they just don't want to give customers hardware they won't need but will still add weight and potential maintenance. Or, cynically why pay for putting radar units into cars that won't need them.