Train from London to Yorkshire: Clarification Needed

You cannot take a train "from London to Yorkshire" because Yorkshire is a historic county (and region), not a single station or city.

What You Probably Mean

• London King's Cross → York: ~1h 50m (LNER Azuma), direct.
• London King's Cross → Leeds: ~2h 15m (LNER), direct.
• London King's Cross → Sheffield: ~2h (LNER/East Midlands), direct.
• London St Pancras → Sheffield: ~2h (East Midlands Railway), direct.
• London Euston → Manchester: ~2h 10m (Avanti), then connect across Pennines.

Yorkshire's Main Rail Hubs

• York – Historic north-east.
• Leeds – West Yorkshire commercial center.
• Sheffield – South Yorkshire (technically in Yorkshire).
• Hull – East Yorkshire (via Doncaster/Leeds).
• Harrogate, Bradford, Huddersfield, Wakefield, Doncaster, Middlesbrough (Tees Valley).

Specify your destination town/city in Yorkshire to get accurate times, fares, and operators.