1. Starwood Preferred Guest points can be transferred to the USA passenger rail operator Amtrak:
Take the scenic route: Transfer Starpoints to Amtrak Guest RewardsŪ at a 1:1 ratio and get on the next train.
http://www.starwoodhotels.com/prefer...em/travel.html
https://www.amtrakguestrewards.com/
2. American Express Membership Rewards (UK) points can be transferred to Eurostar:
http://catalogue.membershiprewards.c...rtners-es-logo
Note that each country has its own version of Membership Rewards with its own partners, earnings rate and redemption ratios. Availability of this award in the UK does not imply availability in other markets.