“Which route would be considered default ” – that’s not what default means; there’s no one specific ‘default route’. 6.30/4.20 is what you get charged if you do this journey (within maximum journey time) using ANY OTHER route, that doesn’t OSI at Vauxhall or Elephant and Castle or the Batterseas, and also doesn’t use the LU side of a South London terminus.
You could go:
Tolworth –NR– Wimbledon –LU– Liverpool St
or
Tolworth –NR– Wimbledon –LU– Paddington –EL– Liverpool St
or
Tolworth –NR– Clapham Junction –LO– Whitechapel — EL — Liverpool St
or
…
You get the idea. Just remember to stay within MJT!
