This was a first pass at recreating the letterforms in Illustrator. At this point, I'm missing a photo of a "Q" and I synthesized both the "X" and the "Z" from elements of other letters.
Since the original tiles were all hand lettered, there was a fair amount of disparity among letters. The "S" at one station would look slightly different from an "S' at another station.
Also, all of the subtle serifs had variations, which I decided to try and standardize in the second pass.