railroad sandwiches的意思是(源于欧亨利的《女巫的面包》)

Well, to-day—well, you know, maam, that butter isnt—well, Blumbergers plan isnt good for anything now except to cut up into railroad sandwiches.

源于欧亨利的女巫的面包这里railroad sandwiches是指什么？从Blumbergers plan kl开始这半句如何翻译呢？

railroad sandwiches：在铁路上兜售的三明治。

Blumbergers plan isnt good for anything now except to cut up into railroad sandwiches.

布兰伯格的方法目前干什么都不好使，只能切成铁路上供应的三明治了。

is not good for anything except = is good for nothing except （除去...以外都没用）

except： 除去...以外。多跟否定意义连用。