I distinctly remember my mom having a good laugh at my expense for thinking this.
For awhile I thought I was the only silly one. Later in high school, a random conversation with some friends revealed a whole bunch of us that grew up thinking the same thing!! I don't know how widespread the idea is, but I do know that there is one particular station in the East Bay that looks very much like the old "DL Hotel" monorail station used to look (before it was swallowed up by DTD). At least, it looked close enough to confuse a kid's brain.