Pho in downtown Houston
From the local reference site - Vietnamese restaurants downtown, a couple in easy walking distance.
An area of Midtown used to be called Little Saigon; these will be 4-5 blocks from the rail line at most:
I have heard good things about Pho Saigon and Pho Tau Bay but have never been. I've been to the Givrals on Milam but only for banh mi; there are several Givrals around town but I don't know if they're all related. Also have eaten at Thiem Hung on Pease but that is a very long walk from where you are or the rail.
We like the Pho at Thien An Sandwiches, 2905 Travis... in a new-ish strip mall. It's walking distance from the light-rail McGowen stop. I get the Pho with sliced brisket. I like this one the best. I think it's awesome! But don't take my word for it... My husband, who spent some time a few years ago in Vietnam, says it's definitely a "worthy" dish. Try getting there a little on the early side for lunch though, the place is small and gets packed in a hurry. Also, I personally like their Banh Xeo ( A.K.A. Vietnamese Pizza) and their egg cakes.
Thien An Sandwiches
2905 Travis St, Houston, TX 77006