(Yesterday, 10:45 am)Storx wrote Hartlepool can't do full length vehicles because of the pits, so the only way they could do that would be upgrade routes elsewhere.
The likes of 3/4/7/8 at South Shields due to recent frequency cuts and interworking or the 23 at Sunderland would seem the obvious routes if you wanted to do something and then displace the E200's to Hartlepool. I'll let someone else choose, which ones.
Means everyone gets a little upgrade.
To be fair looking at the route maps of Hartlepool's Services 3/3A/6 & 7 could easily be merged with Stockton's 34/35 from Billingham and the 36/36A, only issue would be if the E12 can manage the pits.