A key feature of the HS2 proposals is that the new high-speed track will mix with existing conventional track to form the complete network. Purpose-built conventional trains will be capable of operating on the new spine of high-speed track at full line speeds, then seamlessly run onto conventional tracks at speeds of or below. This will enable trains to reach destinations served only by slower high-speed tracks, such as Liverpool, Glasgow, Edinburgh and Newcastle, using a mixture of conventional and high-speed track. HS2 trains are non-tilting; however, non-tilting speed limits are being increased from 110 mph to 125 mph in some places and modifications to the alignment of the WCML are planned, which will make tilting trains no longer necessary.