Can you park in permit parking lot with disabled placard (behind railroad museum)?

Yes, they have permit parking.

Thanks everyone for your help and advice...we will park in parking structure...just to be safe and sure.

I know the parking structure across the street has ample handicap parking, elevators, and van parking as well

I don't know about the permit parking lot, but there are ample street parking available to disabled parking for free.

I believe so. I would look up California DMV handicap placard parking information to be sure, but the last time I looked the information up you could.

Yes you may, however you have to purchase a ticket showing you are visiting the museum. The workers park there to. I wasn't able to since I didn't have ticket, was just visiting for a birthday party. Or you can in one of the parking structures.

I believe you can in the parking structure that is right across the street from the Railroad Museum