Wheaton (along with Forest Glen) is also unusual in that there are two separate tunnels at platform level, one for Glenmont-bound trains and one for Shady Grove-bound trains; most stations have only a single tunnel per line, with trains in both directions running either on the sides (the default, doors opening left side!) or down the center (doors opening right side!).
Having two separate tunnels reminds me of many stations of the London underground to the point that it comes as a surprise not to find any Cadbury Egg vending machines or Way Out (not to be confused with Far Out) signs.