So Member of Parliament Cecily Whipplethwait (for instance), whose father and grandfather both worked as train engineers, and who is generally acknowledged by everyone as an expert on the industry, is appointed shadow minister for transportation.
In some parliamentary systems, the "out" party in parliament forms what is known as a "shadow cabinet." They appoint one leader from their own ranks to serve as party leader, who essentially becomes the "shadow prime minister." But then they go further and also appoint other sitting members as "shadow ministers" for all the various departments.
But these are not normal times, so why would anyone expect Donald Trump to be a normal ex-president? Instead, Trump will likely become what could be called a "shadow president." Now, this requires a digression to explain what I mean by that term, so please bear with me. They do not regularly involve themselves in the day-to-day political struggle, but instead take a more gentlemanly approach and for the most part refuse to second-guess the new Oval Office occupant (at least, in public). Ex-presidents are generally known for largely retreating from the public stage and assuming the role of "elder statesman" within their own party. In more normal times, this might be the case. Biden himself is somewhat of a proponent of this viewpoint. In this fantasy, the Republican Party will wake up from its four-year delusion, shake its head in bewilderment, and then go back to being a normal opposition party in American politics. Many are assuming that Trump will somehow magically disappear from the political scene. If Joe Biden wins the election, what will President Donald Trump do next? Let's ignore all the expected lame-duckery for the moment (lawsuits against the election results, epic tantrums, Trumpian chaos, self-pardons, refusing to attend the inauguration, etc.) and take the longer view of what Trump will do after Biden is sworn in next January. This is in no way guaranteed, of course, but the rest of the article makes no sense unless this happens.