Can you transfer directly from Diners Club???

For Starwood you can do:
Starwood Hotels & Resorts Preferred Guest converts to (starting) 100,000
* Amtrak Guest Rewards (at a ratio of 1:1) converts to 100,000
* Choice Hotels Choice Privileges (at a ratio of 5000:15000) converts to 300,000
Southwest Rapid Rewards (at a ratio of 6000:1800) Total: 90,000

But you have to spend $250 on Amtrak using Amtrak credit card.