This Northern Line Cheat Will Save You Minutes On Every Commute | Londonist
... What if the first train you board at Hampstead is going via Charing Cross? In that case, things aren’t quite so simple. For a start, most Charing Cross trains terminate at Kennington — only during peak times do a few services go all the way to Morden. Riding all the way through to Balham normally isn't even an option.