The single-carload business is not being solicited any more. The payback does not justify the expense these days. It takes a lot of people to handle single car shipments from pickup to delivery. The shippers gave up on it, too. They can no longer call downtown to the local railroad agency, release a loaded car, and expect to have it picked up promptly.
For the most part, industrial spurs are, and will remain, unused. They don't even build tracks into new industrial parks any more.