Train from London to Amsterdam ?

You can do it via this site:

http://www.nshispeed.nl/en

or via the Eurostar website in London.

The Chunnel train site doesn't allow ticketing from London to Amsterdam:

http://gyazo.com/014771139b111b2c00a4888a6a365c50

Maybe not, or maybe.

Using the link I provided above, I got as far as entering my name and completing payment on

London to Amsterdam CS
London St Pancras Int'l to Brussels-Midi
Eurostar
Departs 12:58 on Tue, 13 May
Arrives 16:08 on Tue, 13 May
Standard Non Flexible
Brussels-Midi to Amsterdam CS
Thalys
Departs 16:52 on Tue, 13 May
Arrives 18:42 on Tue, 13 May
Comfort 2 Non Flexible
1 x adult (£64.50)£64.50Amsterdam CS to London
Amsterdam CS to Brussels-Midi
Thalys
Departs 09:18 on Thu, 15 May
Arrives 11:08 on Thu, 15 May
Comfort 2 Non Flexible
Brussels-Midi to London St Pancras Int'l
Eurostar
Departs 12:52 on Thu, 15 May
Arrives 14:03 on Thu, 15 May
Standard Non Flexible
1 x adult (£64.50)£64.50

Total:£129.00

Looks like it was allowing booking to me. As you said, David, in your original question, the name is Eurostar. No bold letters required.

Looks like if you tell the Chunnel site you live in the UK, instead of the USA it will allow Americans to select Amsterdam as a destination. But you're still better off using the http://www.nshispeed.nl/en site as the exchange rate is better. You'll be charged Euros, instead of pounds like the Chunnel site forces on you.

For example:
By using the Chunnel site for the 8:04am departure on April 24 the fare is 103.50 pounds. Which works out to $172.72 USD.

By using the NH Hispeed site for the very same departure you are charged 117.50 euros. Which works out to $161.12 USD.

So as you can see it's a $11.60 price difference. That will buy you some extra french fries in Amsterdam. Bon Appetite!

Thank you Michael and Nigel. I'll try both ways and I appreciate your helpful responses.