Trains. St Pancras International is set at the heart of Central London with more underground connections than any other London station. There are four main services from the station – Eurostar, East Midlands Railway, Southeastern and ThamesLink.
Midland spent years borrowing platforms at King's Cross and Euston, before eventually pouncing on some land to build its own terminus. And that's why there are two separate stations. And as to why they were so close, it was a simple matter of land availability in a rapidly-growing metropolis.
What if I miss my Eurostar / National Rail journey as a result of delay? If you miss your Eurostar service as a result of delays or cancellations to your National Rail service on your outbound journey you will be placed on the next available service to your Continental destination at no extra charge.
The longest UK train journey is Aberdeen to Penzance. Covering 785 miles, this train journey takes about 13 hours and 20 minutes to complete (give or take a few minutes).