Maybe a Tidbyt? Looks like it works for a few US cities' transit systems. https://tidbyt.com/
I haven't used this personally, though, so can't really vouch for it yet
I don't like the Tidbyt v2. I hated it from the minute I unboxed it, would not recommend. The pixels are very blurry and the image is not crisp at all. The v1 was pretty good, looks more like a dot oriented board (far less resolution). more discussion: https://discuss.tidbyt.com/t/gen2-blurry-screen/6654
I replaced the tidbyts with a Dakboard, specifically a https://shop.dakboard.com/products/pixeltoptech