Reece has had well over 100 Twitter accounts over the past few years. I think most railway enthusiasts and workers who use Twitter have come across him.
Here are just some of his accounts:
www.twitter.com/northern_4
www.twitter.com/richard54075625
www.twitter.com/thomasw51068766
www.twitter.com/johnny_graver
www.twitter.com/callumm82735115
www.twitter.com/chrismcgarry15
www.twitter.com/shaun41960722
www.twitter.com/alanmaughan4
www.twitter.com/justinmaughan1
www.twitter.com/dave57537016
www.twitter.com/dont_ring
www.twitter.com/friendforevery3
www.twitter.com/hshinyppl
www.twitter.com/reece11854524
www.twitter.com/reece41067204
www.twitter.com/reece83361106
www.twitter.com/reececa60216740
www.twitter.com/reececa99638994
www.twitter.com/stokellgarry
www.twitter.com/wilki_kate
www.twitter.com/katehar67016109
www.twitter.com/chris37510452
www.twitter.com/chris44260584
www.twitter.com/ianwander1
This is only a small selection. He has hundreds more as well.
Basically what he does is spend all day asking for unit numbers of Northern Rail trains in the Hartlepool / Middlesbrough / Redcar / Saltburn areas.
He used to be asking Northern Rail all day long for about 40 or 50 unit numbers a day and after they gave him about 10 he would still keep bothering them and asking for more. Eventually they restricted him to 1 unit number a day but he still wouldn't stop bothering them and asking for more all day so they don't give him any these days.
He regularly tweets pretty much every other TOC in the UK asking for them to look up Northern Rail unit numbers. He will also keep bothering random people trying to get them to find out unit numbers for him.
He also sometimes creates multiple accounts pretending to be different people and talks to himself. He also sometimes creates accounts pretending to be his social worker or his mum.
He seems to have a huge obsession with unit numbers. I think he must have autism or some other mental health problem or learning difficulties.
As yorkie said it is probably best to just mute him if he annoys you. Don't block him as all he will do is simply create another account again and again and again. I personally just ignore him. He is certainly an interesting character.