Re: Stop whining...
That's his point, isn't it ?
He didn't find himself on an unaccountably crowded train. He went on the train witrh the intention of making a point that they're often overcrowded and underinvested. Yes, should have tried Southern (or Thameslink which they're busily degrading too .. no late trains on a saturday night !) . But booking doesn't make spaces - it just allows you to sneer at the other passengers. Something Corbyn is less likely to do.
Who remembers Osborne's (I know .. who he?) train journey ?