AtD translation: brick courses inside the little tunnels

[Mike Weaver]

A course of bricks is a layer and there are only a few short tunnels on 
the train lines from London to Cambridge, no big hills for the line to 
go through.

On 06/03/2022 08:28, Mike Jing wrote:
> P688.15-20   Only thing to do really was to try and take Renfrew by
> surprise. On the way up to Cambridge once again, English country, green and
> misty, booming past, brick courses inside the little tunnels spinning by in
> helical purity, the smell of fens, the distant reach of water-sky
> reflecting the German Sea, for the first time in a good while Lew felt the
> desolate stomach-spasms of exile, and found himself longing for Chicago, .
> . .
>
> What are those "brick courses inside the little tunnels" exactly?
> --
> Pynchon-L: https://waste.org/mailman/listinfo/pynchon-l

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