I commuted for a very short time in Boston on a lady's DL-1 that I found leaning against a dumpster and refurbished. The lack of braking power made me choose a different option!
The OP's DL-1 is an old one. Those front dyno hubs usually have a date code, as does the rear hub. I think those are the triggers that were only produced a couple of years in the late 1940s.