LAP    BFR Lapford London Blackfriars An odd combination, though. Perhaps the OP really meant LTN? Neil Sunderland

   LAP    BFR Lapford London Blackfriars An odd combination, though. Perhaps the OP really meant LTN? Yes I do mean LTN (Luton Airport Parkway). LTN also happens to be the IATA code for London Luton Airport nearby, which has become a rail destination in its own right since the shuttle ceased to operate as a free service. It remains to be seen what the NRS code for the airport will be, hence my labelling of Parkway as LAP (others before me have done so). TTL by the way is shorthand for The Trainline (or in this context any booking site which uses the TTL booking engine/back-office). So...a 1st Cheap Day Return with a Young Persons Railcard discount? Thoughts?

TTL by the way is shorthand for The Trainline (or in this context any booking site which uses the TTL booking engine/back-office). I always thought TTL was a type of light measurement used on SLRs (Single Lens Reflex cameras).  It stands for Through The Lens .

I always thought TTL was a type of light measurement used on SLRs (Single Lens Reflex cameras).  It stands for Through The Lens . SLR cameras, surely? These days, more likely to be data-related: http://en.wikipedia.org/wiki/Time_to_live

These days, more likely to be data-related:   Time-to-live as a parameter of datagrams in a network   Or, as I quoted, Transistor-Transistor Logic   TTL is a MUM, a Multi-Use Mnemonic.   Cheers, L.W.

TTL by the way is shorthand for The Trainline (or in this context any booking site which uses the TTL booking engine/back-office). I always thought TTL was a type of light measurement used on SLRs (Single Lens Reflex cameras).  It stands for Through The Lens . Transistor-transistor Logic , isn't it?  Or am I showing my age?