Looking at Amtrak trains between NY and Boston, I found that all had "no checked luggage" save for a midnight train (less than ideal for a relaxing vacation).
Looking at this reference, it's not really that restrictive as you can take bags on to the train. My question is on the size restrictions of 28" x 22" x 14" (70cm x 55cm x 35cm in my parlance). We'll be travelling with a backpack taller than this, albeit not much (maybe four to eight inches/10 to 20 cms), so I was wondering how much effort Amtrak puts into enforcing this? Has anyone else travelled with an oversized baggage as "carry on"?