Originally Posted by
UKtravelbear
M does = bus but a bus in Manhattan (or runs mainly in Manhattan)
B = Brooklyn
Q = Queens
S = Staten Island
Bx = Bronx
X = Express
Some express buses have more than one borough designation, like the BxM1 or the QM2.
Also N = Nassau County
Meanwhile, the best way to get from THoR to B&H is definitely the F or M to W 4th and then the A/C/E to 34th.