Sentence:  The train was moving less fast through the summer night. The swift express had changed into something almost a <WSD>parliamentary</WSD>, had stopped three times since Norwich, and now, at long last, was approaching Banton. 
Meaning of the word marked with <WSD> tags:  Of a class of train which, by an act of parliament, ran both ways along a line, at least once each day, at the rate of one penny per mile.