Subfigure vertically (!!! not side by side)

Question

I have two PDF figures. I would like to combine them to make one figure with sub-figures (a) and (b) so that they appear vertically (figure (a) is on top of figure (b)), NOT side-by-side because my document has 1 column. I found only for side-by-side. Using package subcaption I tried as follows:
begin{figure}[h]
begin{subfigure}{textwidth}
includegraphics[trim=70 30 90 60,clip,width=textwidth]{FigA.pdf}
caption{Figure A}
end{subfigure}
begin{subfigure}{textwidth}
includegraphics[trim=70 30 90 60,clip,width=textwidth]{FigureB.pdf}
caption{Figure B}
end{subfigure}
caption{Main caption}
end{figure}

However, although the figures appear vertically, the figure (b) intersect the caption of the figure (a). If there is no other way to organize them, how can I add space between them?

egreg · Answer

You will get the two subfigures stacked vertically with the code you present, because the space after the first end{subfigure} allows for a line break.
However, a blank line and some additional vertical space will provide some separation.
In the code I had to add height=8cm in order to not exceed the page dimensions. Your images are probably much less tall. In any case, such big float should have a p option, or it might block the float queue.
documentclass{article}
usepackage{graphicx}
usepackage{subcaption}

begin{document}

begin{figure}[htp]

begin{subfigure}{textwidth}
includegraphics[trim=70 30 90 60,clip,width=textwidth,height=8cm]{example-image-a}
caption{Figure A}
end{subfigure}

bigskip

begin{subfigure}{textwidth}
includegraphics[trim=70 30 90 60,clip,width=textwidth,height=8cm]{example-image-b}
caption{Figure B}
end{subfigure}

caption{Main caption}

end{figure}

end{document}

Subfigure vertically (!!! not side by side)

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