thE Author mEntions All oF thE Following As BEing truE ABout thE litErAturE oF rAilroADs ExCEpt thAt ______.
A．mAny oF its writErs hAD ExpEriEnCE working on rAilroADs.
B．mAny oF thE Books wErE sEt in rAilroAD stAtions AnD yArDs.
C．thE Books wErE wEll known During thE rAilroADs' primE yEArs.
D．quitE A FEw oF thE Books ArE still populAr toDAy.