On Tuesday I'm arriving at AMS from IAD at 8:20 AM connecting a flight to JRO at 11AM (all on KLM). What can I expect? Do I go through customs or will we be able to go straight to our next gate? Do we have to go through security at the gate in AMS or is that only for flights to the US?

On the way back in another 2 weeks, we have a 6 1/2 hour layover and plan on taking the train to do a canal cruise and maybe a quick bite before heading back to the airport for our return trip to IAD. That is on a Sunday, do fewer trains run on Sundays? Just trying to figure out how much time to set aside for returning to the airport.